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Clarence Kennedy Posted on Oct 26, 2013
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91 gmc 350v8 running rough at idel and high rpm

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David Gerzseny

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  • Contributor 14 Answers
  • Posted on Oct 28, 2013
David Gerzseny
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Joined: Oct 27, 2013
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Check the mass air flow meter,, on the air intake hose. ONLY USE AIR FLOW METER CLEANER! First I would check the air filter. sounds like the engine is starving for air. Check all your vacuum lines also for leaks. Make sure all are attached to where they go. Also a possible dirty throttle body !

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Anonymous

  • 6 Answers
  • Posted on Dec 20, 2008

SOURCE: high rpm at start up un 1996 gmc sonoma

no it wont start if the cam sensor goes out check to see if there is a vac line off somwhere 9 times out of ten its a vac line

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Anonymous

  • 3489 Answers
  • Posted on Dec 28, 2009

SOURCE: I have A 1993 gmc jimmy,It has A rough idle,idels

this is related to the egr system and makes sense when you describe a rough idle. the egr is probably stck open slightly. remove and attempt to clean with carburretor cleaner. it also helps to have a vacuum pump so you can work the diaphragm up and down. happy holidays

Anonymous

  • 395 Answers
  • Posted on May 23, 2010

SOURCE: 4.3 L will not idel

check the Idle Stop Solenoid

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1helpful
1answer

Car engine idles really high then really low, why?

It can be issue with IAC( idle air control valve) causing the problem.


There are many other possibilities causing these idle issues. Engine idles rough.

There are few help links with solutions to troubleshoot such idle issues.

I suggest you refer the link below and follow its troubleshooting details:------

Click the link below:-----

Ford Expedition IAC valve replacing

http://technoanswers.blogspot.com/2012/12/ford-expedition-iac-valve-replacing.html

Bad miss at idle?

http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

-----------

Stumbling and stalling at idle after engine rebuild?

http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html

------------

1999 Ford F-150 Idles rough and quits when gas pedal is pressed less?

http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html

---------

Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

------------------

Erratic idle on car?

http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html

-----------


Cold start problem and vehicle shudder around 2500 to 3500 rpms

http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

----------

Low idle when cold out side?

http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

-----------

GMC Sonoma Stalls and idles low

http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html

--------


GMC Idle Air Control (IAC) Valve Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

-------------

1996 Camry intermittent engine failure while idle?

http://repairhelpcenter.blogspot.com/2011/10/1996-camry-intermittent-engine-failure.html

------------

Engine quits at idle?

http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html

-----------

Car overheats and Air blows hot at idle?

http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

---------

High Idle Problem

http://repairhelpcenter.blogspot.com/2012/10/high-idle-problem.html

-------

While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

---------

Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed?

http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html

--------

High rpm in neutral? Inconsistant high RPM in neutral?

http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html

-------

Vehicle stumbling at idle and shows code 54?

http://schematicsdiagram.blogspot.in/2012/03/vehicle-stumbling-at-idle-and-shows.html

----------

Rough idle, staling and Erratic shifting?

http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html

-----------

While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

---------

These details will help.

Thanks.

Read full answer
Feb 15, 2013 • 2003 Pontiac Grand Am
0helpful
1answer

Does not idel well some time engin light comes on missies for 2 secomds

It can be issue with IAC( idle air control valve) causing the problem.


There are many other possibilities causing these idle issues. Engine idles rough.

There are few help links with solutions to troubleshoot such idle issues.

I suggest you refer the link below and follow its troubleshooting details:------

Click the link below:-----

Ford Expedition IAC valve replacing

http://technoanswers.blogspot.com/2012/12/ford-expedition-iac-valve-replacing.html

Bad miss at idle?

http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

-----------

Stumbling and stalling at idle after engine rebuild?

http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html

------------

1999 Ford F-150 Idles rough and quits when gas pedal is pressed less?

http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html

---------

Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

------------------

Erratic idle on car?

http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html

-----------


Cold start problem and vehicle shudder around 2500 to 3500 rpms

http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

----------

Low idle when cold out side?

http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

-----------

GMC Sonoma Stalls and idles low

http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html

--------


GMC Idle Air Control (IAC) Valve Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

-------------

1996 Camry intermittent engine failure while idle?

http://repairhelpcenter.blogspot.com/2011/10/1996-camry-intermittent-engine-failure.html

------------

Engine quits at idle?

http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html

-----------

Car overheats and Air blows hot at idle?

http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

---------

High Idle Problem

http://repairhelpcenter.blogspot.com/2012/10/high-idle-problem.html

-------

While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

---------

Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed?

http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html

--------

High rpm in neutral? Inconsistant high RPM in neutral?

http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html

-------

Vehicle stumbling at idle and shows code 54?

http://schematicsdiagram.blogspot.in/2012/03/vehicle-stumbling-at-idle-and-shows.html

----------

Rough idle, staling and Erratic shifting?

http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html

-----------

While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

---------

These details will help.

Thanks.

Read full answer
Jan 08, 2013 • 2005 Mazda B3000 Cab
0helpful
1answer

1996 GMC jimmy rough idel and dieing when driving.
i have seen many strange things happen with the distrib cabs on these
Read full answer
Aug 22, 2012 • 1996 GMC Jimmy
0helpful
1answer

Runs very rough and idles at 950 rpm, is this fast?
Sounds like a vacuum hose leak. Look under the hood for any cracked vacuum hoses and replace. listen for hissing noise.
Read full answer
Mar 07, 2012 • 2000 GMC Jimmy
0helpful
1answer

JERKS AND HESATATES LIKE GETING AIR IN THE FUEL OR SOMTHING ROUGH IDEL AND RECENTLY NO START AFTER RUNNING MESSED WITH IT FOUND IT HAS GAS AND SPARK TOOK AIR CLEANER OFF GOT IT TO START NOW NO PROBLEM THIS...
Im thinkin 1 & 19 or 9 in puug .Conect w/ clip....To be sure call auto parts store.. have you changed fuel filter its under drivers side along inside frame ..good luck ;';'
Read full answer
Mar 02, 2011 • GMC Safari Cars & Trucks
0helpful
1answer

My 91 deville is running really chuggy and sputers,we chnged plugs wires,and it still ideles high and rough any suggestions would be appreciated : ) the car only has 73000 actual miles and i hate to get...
check to see if the catalatic converter and any exhaust pipes underneath are getting red hot when running cat could be plugged
Read full answer
Jan 01, 2011 • 1991 Cadillac DeVille
0helpful
1answer

4.3 L will not idel
check the Idle Stop Solenoid
Read full answer
May 22, 2010 • 1992 GMC Safari
1helpful
1answer

Rough idle then stalls
Vacume leak or bad idle motor. With the car in park and running with the hood open listen for leaks moving your hand around the different hoses looking for a change in the sounds that you hear. The idel motor also makes the car idel up to 1500 RPM or so right at start-up then idel down, If it doesn;t the idel motor is likly. Check engine light is on when running? Test for codes, Follow code test charts don't skip any steps!.
Read full answer
Nov 02, 2009 • 1998 Chevrolet Malibu
5helpful
1answer

91 Jeep wrangler New everything idles rough, no Power then dies
you check for miss how is compression
Read full answer
Aug 29, 2009 • Jeep Wrangler Cars & Trucks
1helpful
1answer

2002 NEON IDELS ROUGH AND IDELS HIGH RPM.
sounds like the intake hose from throttle body is not on intake manifold properly..as for the p0700 trouble code,you need trans controller scanned for fault codes..let me know what codes are in trans controller
Read full answer
Mar 15, 2009 • 2002 Dodge Neon
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