Rough Idle In Morning

hope this helps you. Rough Idle Solved We traced it back to a bad fuel pump. there is a rough idle in the morning for about 30 seconds to a minute while the car is warming up. On most morning at initial start-up the engine has a rough idle until temp gauge reaches normal range. Does anyone know where its located? Also will a bad 02 sensor make it run rough all of a sudden? It has been an AWESOME running vehicle until this morning. Good morning, This one may sound stupid but, my 67 DeVille FoldyTop had a rough idle issue that went away by itself when we were driving on a 97 degree day. Re: 99 civic rough idle Thanks for the input. I'm bothered with the rough idle when the engine is cold. From a cold start, usually in the morning, the 1st 10-15 seconds run rough before settling down to idle. It starts just fine, but shakes and idles rough untill I press on the accelerator, then seems to run/idle just fine. It still idled a lil rough but not as nearly bad as it has. Especially in the morning with white smoke when first started. When it is hot it runs good! I went out and started up this morning after clearing the codes and it idled rough and within a minute or two check engine light came on. pop in drive and with foot off brake all is ok. Usually only happens when it's sat in the cold (<30 degrees) and I start it up in the morning. So my truck has been running pretty bad ever since I changed the oil. Its a little motor that opens a passage for air to get into the engine when it idles. The 2003 Chevrolet Silverado has 7 problems reported for rough idle, runs roughly. I sure do need some professional advice, my 944 just had a new timing belt and runs great when its warmed up, but have noticed that the gas mileage is about 100 miles less to a tank, plus the idle in the morning is very rough until she gets warmed up. Over the weekend the car idled rough and the engine light started to flicker so the car was towed back to the dealer Monday morning. Could a bad O2 Sensor be causing the rough idle or is there something else I should try. But be sure to use the google search bar in top right corner and not the T4R search function because IAC will not show up in T4R's search since it is 4 characters. This morning (again temps in the low 50s), rough idle of the same magnitude, backed out and put in drive, same bucking, check engine light this time and the rotten egg small again. Maybe it just took a week for the cleaners to work, i really don't know. Does my car have the AIDS/Ebola? Posted by Schwartz on 11/21/14 at 5:26 pm. Guy with the 48 buick here (Matt). Car still starts and idles rough until I rev the RPM's up high. Usually only happens when it's sat in the cold (<30 degrees) and I start it up in the morning. BACKGROUND I bought this 4runner from the first owner. With amount of miles you have, I'd bet it's spitting oil vapor into intake and that in turn is gumming up IAC. I've been throwing this one for ever so I don't think. ID 1000 injector data/rough idle when cold Does the following data fit in with what most guys are using for ID1000 in an FGT. Hello again. If the rough idle occurs only under cold start conditions, a malfunctioning engine coolant temperature (ECT) sensor may be at the root of your problem. Lasts about 2 mins Come back 15 mins later starts/runs fine. The bore of these hoses is quite small and it is not unknown for the flow of coolant to the idle speed control valve to be restricted or even blocked. After warm up or quick blip of the throttle, everything back to normal. The engine was turning over very fast but she would not fire. Sometimes, the "transition" happens while at idle. Rough Idle Discussion in ' Seems that it is running better but will have to test in it in colder weather one morning. I put some throttle to it and the shaking stopped. Codes po171, po174, p2195, and p2197 popped up on the reader. 9 Z3 had a rough idle (sounds like a lumpy v8!). when starting engine it appears to sound fine. Chevrolet Silverado 1500 Rough Idle? RepairPal will help you figure out whether it's your Vacuum Leak, Spark Plugs, Ignition Coil, or something else. I've been throwing this one for ever so I don't think. The factory tune is designed to try to get the cat up to opperating temps as quick as it can. It has a very rough idle and no matter how much I turn it down it will always stick around 1500 rpms for about 5 minutes before it goes down to about 900 rpms. had to put it in neutral and rev it a little. Was due it's 110k service, so thought maybe after having that it would be OK. I had the coilpacks replaced, open recall from Audi, and also the valve cover gasket. The 2003 Chevrolet Silverado has 7 problems reported for rough idle, runs roughly. My White Pearl XV, which I picked up last Monday with 7 miles, is my first Subie. 700 is on the low end of the engine's idle speed so it may be slightly rough. Hi, im new to these forums. Idle Speech. 5 Ecoboost - has 5,500 miles on it - bought three months agoIn the morning, when I start it up, it starts fine, but it will idle real, real, real roughgive it some gas, idle will smooth out. Have the 2nd-gen 2007 MDX with only 22K miles on it. and if i drive it on the high way above 40mph before it is warm it shakes like crazy. Mine was running pretty rough in the mornings (Mine would idle at 1600rpm), so I decided to run some seafoam through the vacuum line. You’re read light novel Ascendance of a Bookworm Chapter 114 – Idle Talk online at NovelOnlineFull. While I was in the shop office talking with the owner, the mechanic came into the office and told me that I didn't need to hang around, he was going to have to keep the bike until tomorrow. Car starts rough when the engine is cold. 2-4 gear no problem but when I hit 50 km/h and it goes into 5th gear it started to stumble. Unfortunately the parts won't be in til tomorrow so we went home MINI-less. It will often die on me unless I feather the throttle. Good morning, This one may sound stupid but, my 67 DeVille FoldyTop had a rough idle issue that went away by itself when we were driving on a 97 degree day. Originally used to describe independent record labels, the term became associated with the music they produced and was initially used interchangeably with alternative rock. all in less then a yr. I might get more requests about idle issues than any other topic. 04 F-150 XLT 4x4 with the 4. Thinking it's something electrical/sensor. There are a lot of things that can contribute to an idle issue on your Honda. The "pro" tune in this particular car has a rough idle in the morning which the owner would like to get rid of. Joy s an act of resistance is a great album. When I had a bad coil I was running on 3 cylinders. Also, minor roughness when idling - almost like a slightly cammed up car that rumbles a little during idle. While there are a variety of reasons your Chevrolet Silverado 1500 has a rough idle, the most common 3 are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil. Good morning, This one may sound stupid but, my 67 DeVille FoldyTop had a rough idle issue that went away by itself when we were driving on a 97 degree day. Many different problems could result in a rough idle for your car or truck, including: dirty fuel injectors, clogged air filters, bad spark plugs, and a variety of exhaust system issues. Thinking it's something electrical/sensor. 3L SOHC (VTEC) MFI, 108,000 miles. pop in drive and with foot off brake all is ok. Awaiting Monday for service to check it out. After a few minutes it goes away. 2000 alero rough idle from cold start Results 1 to 6 of 6 Discuss 2000 alero rough idle from cold start in the alt. Specifically, in the morning when the car has been started from a cold state, I: I. i have a 2004 ford f250 powerstroke 6. R1100RS rough idle. Im having issues with my 2006 M45. The engine still idles very rough and shakes when below 1000rpm but seems to run smoother above 2000. Unfortunately the parts won't be in til tomorrow so we went home MINI-less. Rough idle only when engine cold (in morning) Car has rough idle (revs bounce up a bit repeatedly when car is stopped) first thing in the morning. I have replaced the AFM, O2 sensor, tested the ICV,replaced the TPS, replaced the engine temperature sensor, and replaced the intake manifold gasket. For the last couple of months I have been getting a rough idle in the morning or when the car cools down typically 4 to 5 hours. If the car starts when cold but, idles rough or does not want to stay running, this can indicate a problem with the engine. Re: LOW ROUGH IDLE, Sometimes dies! I had all the same crap, did all the same stuff everyone else above did, made some gains however the bottom line for my truck was a Throttle Positioning Sensor. The RPM goes up and down when idling. and i also notice a huge power loss during that time period. I started having a rough idle issue with my 2004 Chevrolet Silverado, 5. one thing I have noticed though is If I turn the key to run but don't start the car right away then it Idles fine or not as rough. my question is will a combination of a toque converter out of a v6 700r4 stall be too low (1000-1100) a oem alternator from 3. Is this normal? Spark plugs are only 20k ish kms old - not sure about coil packs. Rough idle 3. Hello again. A vacuum leak on a fuel injected engine will cause high idle. Thro' the long and toilsome day, 'Neath a blazing, burning sun, Bear the heat, pursue your way Till your task is done. On the rough idle issue, I've recently syncronised my carburetors as I suspected a slight misalingment: indeed, my right hand side cylinder was pulling a bit more than the other one. Success!!! Just got in from work at about16:00, rested till about 18:00 and then removed and reinstalled all the addaptors for the carb. Engine/exhaust sound like a tractor during these first seconds and engine seems to stall almost. I have no CEL. The idle has been rough for a few months. Was due it's 110k service, so thought maybe after having that it would be OK. Hi - I had the same problem so beware and my car burned up on the road. How To Tell If A Vehicle Is Idling Rough. Hello again. The mechanic cleared the MIL light, but we'll see if it comes back. 5 460 rough idle in the morning I'm trying to nail down an issue in the morning with the truck. I ended up driving another car that day, because of the shaking. Not just a single cylinder missing but seemed like random misses for 30 seconds or so. I had a mechanic inspect the engine and he recommended that i get a rebuild carburetor, which I did. The factory tune is designed to try to get the cat up to opperating temps as quick as it can. I had a bad ECM (computer) that was telling the EGR valve to open when it shouldn't. As soon as I put the car in gear (in Drive) the car vibrates quite bad. The entire car shakes a bit until it warms - Chevrolet 2003 Tahoe question. Is the rough idle engine vibration (which could be a slight ignition misfire) or is the idle speed fluctuating? As noted, misfires usually get worse with engine load. Those of you experiencing the rough idle should have this looked at!. I can let truck sit all day, starts & runs good. The high idle in park/neutral went away and no more rough idle while in drive. Mine was running pretty rough in the mornings (Mine would idle at 1600rpm), so I decided to run some seafoam through the vacuum line. 9 Z3 had a rough idle (sounds like a lumpy v8!). The idle varies on the tachometer by 75 rpm and you can hear the engine change speeds. I idle a minute or less before I drive slowly on. Idles horribly rough, ESPECIALLY in reverse, and when i let off the gas going forward. The idle has been rough for a few months. Is there another senser this might effect making cold idle run rough and even warm starts if its sat a 10-15 minutes but the problem clears up much faster on the warm starts. truck has 63k miles. I checked for intake manifold gaskets for leaks-- none. I have a 95 Buick Lesabre with 89,000 miles on it. Honda Accord: Why Does My Car Idle Rough? Your car is in "park," so why does it want to drive? This article will discuss some of the potential causes and solutions to fix this stubborn car problem. The EGR was removed and has a block off plate by the P. I ended up driving another car that day, because of the shaking. When I start the car it idles rough the engine light comes on. Problem has been intermittent until this morning, the car left me stranded. Our GM mechanic says it is the timing again, but we have had the timing changed 3 times, derailleurs, injectors, ECM, manifold set, plugs, computer assembly, coils and actuator's. After a couple more tries she started to catch and fired up and once running she had a rough idle. My '01 has developed a rough idle, sometimes dies, only in the morning on it's first trip. I might try running a couple of tanks of 95 and see if that improves the startup issue E85 was turned off in the tune as its not readily available here. Good Morning Soundguy Yes it does seem like a dead miss and does smoke at itinal idle The oil light does go out, and I am running the engine at approx, 550 rpm. and i also notice a huge power loss during that time period. started the car again and the problems disappear. I have a 2005 Ford Taurus. My MPV has been running terrific then one morning it starts to idle rough and the CEL light comes on. It has 133k miles on it and gets 47 mpg when I cruise at 60mph My only worries are these: When I start the car in the morning, it idles really rough and smokes a combination of whitish blue smoke. According to About. The "pro" tune in this particular car has a rough idle in the morning which the owner would like to get rid of. 08 Silverado 5. Once warm, it usually. Re: Rough idle when cold Oct 18 2012, 12:56pm Hey man you might want to check you'r timimg or timeing sensor or maybe you'r cam sensor. The idle varies on the tachometer by 75 rpm and you can hear the engine change speeds. 5 Johnson idle speed carburetor setting specification; 80 Johnson outboard stalls out in idle; 99 Johnson 200 efi rough idle; a compression tester shows 4 bar when i idle per piston; correct way to adjust idle mixture on outboard; Johnson+115+hp+idle+speed+adjustment; factory setting Johnson idle mix; how to adjust idle stop screw on an. Then, as if by pure magic, it runs fine the rest of the day. The car has had a slight rough idle since I got it beginning of the year, Â but I didnt really worry about it 'cause it was driving fine. The truck has ran great until recently. 2011 Chevy Equinox stalling/rough idle. Super smooth idle and great acceleration. In looking at the top motor mount, it's obvious that the powerhead base gasket was blown between the motor mount and the exhaust outlet. Im having issues with my 2006 M45. I have a 1997 Explorer Sport 4. Voltage drops, rough idle, voltage returns, smooth idle. Success!!! Just got in from work at about16:00, rested till about 18:00 and then removed and reinstalled all the addaptors for the carb. This morning go to the garage to pull it out to the parking pad to wash and immediately notice that the idle is rough, exhaust pulses from the back of the car sound off almost like a misfire or something and the check engine light is flashing on the dash. Right now at least, it appears to be caused or at least aggravated by the tune. 960 B6304G bad idle maintenance & nonperformance. Could a bad O2 Sensor be causing the rough idle or is there something else I should try. Something of interest is that when the you put the vehicle in Drive and press on the brake, the idle gets worse. A couple weeks ago, it began to idle rough and is difficult to stay running 1st thing in the morning. I went home that night and started my car and the shaking had stopped. It has 133k miles on it and gets 47 mpg when I cruise at 60mph My only worries are these: When I start the car in the morning, it idles really rough and smokes a combination of whitish blue smoke. This time it was rampantly wild at stop lights (sometimes as much as 300-400 RPM) with the engine even cutting off on me once. The car ran fine until 3 days ago, when I started it in the morning and the same thing happened. When starting cold, most of the time, it starts right up (starts cold idle at 2000 rpm, than slowly moves down as the engine temp goes up). Come off the throttle & the IAC is supposed to kick back into action. Re: Rough Idle - first cold morning in Kansas Dec 11 2012, 12:55pm Lots of people a lot smarter than me here but with the 'lean' codes, I'd definitely check to make sure you don't have any leaks at your intake gaskets and make sure all your vacuum lines are intact and nothing is rubbed through/broken, etc. I would say you need to replace the I A C valve (idle air control). Idle Speech. Especially in the morning with white smoke when first started. Re: Codes P2097, P2177: Rough Idle, sputters, sluggish unable to build up boost [quote author=Pololo_MS3 link=topic=201882. I also had the two codes, which I originally thought was from the KN filter. Since the car was at a complete stop whole night, the engine oil temperature falls below its operating range. I have not done a compression test as of this posting. I put some throttle to it and the shaking stopped. When I started my Jeep this morning, the idle was going up and down by itself. IAC as mentioned above also, will cause rough idle and fluctuating rpm's when in park. A vacuum leak on a fuel injected engine will cause high idle. I have been experiencing random rough idle on cold start. When I had a rough idle I changed plugs and plug connectors (2). I find my car idles quite rough on a cold start up (ie when car has been left overnight) It is recommended that there is no need to warm up our cars for too long so I let the car idle (in Park) for 1 minute then take off. Only at idle was it rough. The control module controls engine idle speed with the Idle Air Control (IAC) valve. hope this helps you. but fine after its warmed up. i have an 04 frtliner columbia with 60 series detroit with a rough high idle. 5 v6, 125,000 miles. Decided to just use up the fuel ( full tank ) and see if it will "correct" itself as was the case with the 99 'Explorer I drove the car this morning, and expected a rough idle at startup. It starts just fine, but shakes and idles rough untill I press on the accelerator, then seems to run/idle just fine. Please help if you can. The other morning I was leaving work and the temperature had fallen below freezing for the first time since last spring and the rough idle came back. Rough idle after cold start The last few days I've been noticing the engine idles a bit rough on cold start. IT has a new coil pack and new plugs. It did this on the previous tank I gas too, so it's not likely bad fuel. Answers and questions: nissan frontier rough idle NISSAN Rough Idle Anyone else with a rough idle When my truck is warm and idling at a light the rpms dip slightly and the idle becomes rough enough to feel vibration in the steering wheel and cause a droning low freq type sound in the cab. I have a 2001 Ford Escape XLT V6 4X4. I have verified this a few timesnow I just put it in EV mode when moving around the driveway. 8 v6 cause these issues along with stalling at light and when shifting into gear. I've been throwing this one for ever so I don't think. car wouldn't start, rough idle, white thick smokes from mufflers. on my way home from work today it started a rough idle at a stop light. I am pretty sure I figured out what my problem was, the studs that go into the adaptor under the carburetor, one of them was threaded in so that about 1/16" or so. once it has been started once in a day the cast iron block and head, will hold enough heat/warmth to keep the injectors/fuel warm enough to not need preheating at all. pop in drive and with foot off brake all is ok. Engine light on, currently running intermittently rough at an idle, so much so that the steering vibrates. I can let truck sit all day, starts & runs good. The effects were that the engine would come down to an extremely rough idle (sometimes stall) and nasty gray smoke would come from the exhaust. How rough is the idle? If you are running on 3 cylinders then that is more like barely running. I say that because Ive sat in it as soon as i turn it on in early a. Is the rough idle engine vibration (which could be a slight ignition misfire) or is the idle speed fluctuating? As noted, misfires usually get worse with engine load. What causes a rough idle? A rough idle can be caused by many different car faults. No other problems other than when sitting overnight. I have a 2003 GMC Sierra with about 117,000 miles that has a rough idle when you first start in the morning. Just recieved this code this morning, has not gone away. Took it to the dealer and they said that is normal for a 4. 1st gen cummins rough idle first start of the day. IT has a new coil pack and new plugs. Idle is right at 650 rpm. it hesitates when your excelerate but just sometimes. 9L 2wd This morning I noticed for the first 5-10 min while driving, when going an an upgrade or a bit of a hill the truck had a hard time getting the oomph to boost itself along smoother. This morning it stalled twice before it caught it's breath. when I went to start it this morning, it was idling rough and trying to stall. If the idle speed is fluctuating that could be a fuel mixture problem, perhaps running a bit lean. Generally speaking, more than 1. According to About. after starting i get a rough idle, sometimes you will hear the engine struggle a bit and you see the revs drop slightly. Hey Guys I have a 2009 Dodge Charger with a 3. Success!!! Just got in from work at about16:00, rested till about 18:00 and then removed and reinstalled all the addaptors for the carb. I really like the car and outside of this issue (hopefully past issue) I think its going to be a great vehicle. On the first start of the morning or after the truck has sat for about 4 hours or more, the truck starts strong like normal, but then idles poorly to the point of sounding like its about to stall for about 10 seconds, and then everything smooths out and goes back to normal. I have a 2002 Tundra 3. when i first start it in the morning on the cold start it idles very rough and smooths out after the motor warms up. I was changing over some pads and disks the weekend and when I was driving home from my friends house i noticed my 1. The factory tune is designed to try to get the cat up to opperating temps as quick as it can. If the temp in columbus is anything like it is here it was cold this morning. When I put it into drive or reverse and give a little gas to pull out of my driveway it will idle a little rough again for a few seconds, smooth itself out then its fine. It allows air past the throttle plate at idle, and the IAC (Idle Air Control valve) opens and closes depending on how the car needs to idle. The engine struggles to keep it above 7-800 RPM. has been above 60 degrees the duration of the rough idle has decreased or disappeared. Cranks hard, but just won't catch. When I go to warm it up in the morning, it high idles properly, but when it settles down into it's warm idle, it idles rough. Thro' the long and toilsome day, 'Neath a blazing, burning sun, Bear the heat, pursue your way Till your task is done. Tried to drain fuel from Benz but needed a longer tube to siphon the gas. It idled fine while I was getting dressed (letting it warm up). My '01 has developed a rough idle, sometimes dies, only in the morning on it's first trip. i have an 04 frtliner columbia with 60 series detroit with a rough high idle. DIAGNOSE - ENGINE IDLES TOO HIGH. Decided to just use up the fuel ( full tank ) and see if it will "correct" itself as was the case with the 99 'Explorer I drove the car this morning, and expected a rough idle at startup. Replace 3 motor mounts (at the shop) - except the rear 2. Sometimes, the "transition" happens while at idle. I have an intermittent rough idle issue. Stand ye idle, nothing do? Enter in without delay: I have work for you. idle synonyms, idle pronunciation, idle translation, English dictionary definition of idle. I ended up driving another car that day, because of the shaking. It's happened twice now at random times but cant replicate it. My little rabbit has been great so far. Checked the injectors, measured the fuel pressure, ignition coils, and from the ODB I can see the O2 sensors working fine and there is air pressure and temp data. as we get further into winter it will get worse. I've been throwing this one for ever so I don't think. Tried to drain fuel from Benz but needed a longer tube to siphon the gas. Just got home from work and tried starting the car again. Each morning, my truck started up without a rough idle at all. After the CEL flashed this morning, the rough idle went away--weird. it has been that way since i bought truck and has survived de-egring, inframe, with new head. Replace the cranckshaft & camshaft sensors (myself) 3. I took it in and both motor mounts replaced and still rough idle just not as bad. When it is hot it runs good! I went out and started up this morning after clearing the codes and it idled rough and within a minute or two check engine light came on. Re: Rough Idle - first cold morning in Kansas Dec 11 2012, 12:55pm Lots of people a lot smarter than me here but with the 'lean' codes, I'd definitely check to make sure you don't have any leaks at your intake gaskets and make sure all your vacuum lines are intact and nothing is rubbed through/broken, etc. Just got a Jetta again - 2010 Limited Edition just shy of 100K miles and I've got one problem with it. 1997 Sebring (Rough Idle Problems) HELP Initial starting of a morning or after periods of time is a battle to keep it running. Rough Idle When Starting Cold, Then Goes Away When Engine Is At Operating Temperature More Details Below I have an older, low mileage vehicle with a V8 engine. Ok here it is: I have a 2005 rs. I have a 2003 GMC Sierra with about 117,000 miles that has a rough idle when you first start in the morning. Rough Idle Discussion in ' Seems that it is running better but will have to test in it in colder weather one morning. It is intended to help you map out a troubleshooting plan. I would say you need to replace the I A C valve (idle air control). It usually didn't move up much at all. has been above 60 degrees the duration of the rough idle has decreased or disappeared. My wifes 2102 srx was running rough this morning and threw a P0056 an P0060 codes. a PI is what comes b4 a service bulliten. 1st gen cummins rough idle first start of the day. Continue reading to diagnose why your Accord's engine is revving while it is parked. One way to check to make sure this is the fault is first make sure you have no open spark then take a can of brake clean or carb cleaner and spray in short bursts around the intake where it seals on each side of the cylinder heads with the engine running when it is cold. It will often die on me unless I feather the throttle. There is alot of things this can be my truck did the same thing,btu this was when i put a new cam in it. Honda Accord: Why Does My Car Idle Rough? Your car is in "park," so why does it want to drive? This article will discuss some of the potential causes and solutions to fix this stubborn car problem. the rev counter needle is not stiff but playing around 1200 - 1400 rpm. Noticeable under 1500RPM's and smoothed out afterwards. A few months back I noticed an intermittent rough idle at start up. Rough idle and cylinder misfire cyl #2 . we no sooner get it back and the engine light comes on again. It was a high pitch tone similar to the humming of a hid ballast. Once the idle dips, it stays at that rpm indefinately. Rough Idle, Vibrating & Shaking Idle Problem BMW 5 Series 3 Series E90 E39 528I 328I M5 M3 Repair Fanatic. £5 from the garage. I noticed that the rough idle corresponds directly to voltage drops on the voltmeter (assuming when the grid heater is kicking in). I know that has been discussed on the other side as a typical 13 problem but sounds funny a 15 doing it. all in less then a yr. Replace 3 motor mounts (at the shop) - except the rear 2. I had noticed occasional rough idle prior to taking it in but ignored it, hoping it was a nothing serious. But be sure to use the google search bar in top right corner and not the T4R search function because IAC will not show up in T4R's search since it is 4. This Is The End Of All Rough Idles On N52 N53 Must Watch - Duration: 16:42. If the idle speed is fluctuating that could be a fuel mixture problem, perhaps running a bit lean. I’ve changed the idle control valve & it’s still the same. It even quickly revs itself to about 2k occasionally when stationary too. COOL! So my car ran great after that until just a couple weeks ago, I started it up one morning and my engine light came on and it was running rough again. my question is will a combination of a toque converter out of a v6 700r4 stall be too low (1000-1100) a oem alternator from 3. Every morning when I go to start my car it idle pretty rough for a few seconds then its fine. Drivers of direct-injected gasoline engines have been complaining about a rough idle and a check engine light that has been illuminating on the dash. and sometimes it will shanke the whole truck at the idle. One way to check to make sure this is the fault is first make sure you have no open spark then take a can of brake clean or carb cleaner and spray in short bursts around the intake where it seals on each side of the cylinder heads with the engine running when it is cold. Re: Rough Idle - can't figure it out!!! Post by C. A bad hose in any part of the engine is easy to fix. Hi, im new to these forums. Thinking it's something electrical/sensor. on my way home from work today it started a rough idle at a stop light. I went home that night and started my car and the shaking had stopped. However, sometimes on a cold start, when I turn the key in the ignition, it will crank, seem like it's stalling (very fast) then rev back up to cold idle -- this whole process is very fast, and hard to. Over the weekend the car idled rough and the engine light started to flicker so the car was towed back to the dealer Monday morning. Recent purchase i installed new: Complete exhaust,cat was bad,knock sensor,cap, rotor,plugs,thermostat, ect temp sensor,replaced rotted vacuum lines,cleaned throttle body,mass air meter,idle control motor ,FI grounding connections and sensor connections, adjusted base idle and throttle switch and now i have a rough idle as before it idled fine but seems to me to be lacking a bit of power. Either it won't start for awhile or crank on it for awhile, runs rough, almost like not getting enough fuel and then is fine. 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks - 1985 7. Gets better with A/C or defroster on. There is no noticeable power loss at speed.