Question about 2000 Pontiac Grand Am GT

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Rough idle under load but smooths out in park or neutral

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Guess this one stumped all experts!

Posted on Feb 02, 2010

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Car runs smooth, until I have to stop at red light or stop sign, then it runs rough. When I put it it neutral, it runs smooth. Could that be the EGR valve sticking? Any help would be appreciated, than


Depends on what you mean by rough. Could be a cylinder misfire.They sometimes are not noticed as engine speed increases during driving or under light load as when idling in neutral but at idle under load as when stopped at a light in drive became noticable.
Could also be running rich. The causes of either are too numurous to list.Consult a good mechanic who can actually see and hear the problem to put you on the right track.

Nov 26, 2014 | 1995 Subaru Legacy

1 Answer

My 1995 jeep grand cherokee laredo 4.0 inline 6


Something mechanical, ignition, or fuel.
It can run rough under a load such as in gear and ok in neutral with no load. Have you checked the plugs and dist cap ?

Feb 11, 2014 | Jeep Grand Cherokee Cars & Trucks

1 Answer

Rough Idle when in Drive,Idle is smooth when in Neutral and Park.


check the Intake Air Boot really close. . its the big hose between the air filter and the engine if it has a rip in it, thats your problem.

Dec 06, 2010 | 1992 Mazda Protege

2 Answers

I have a 325bmwxi that is idleing roughin drive


bmw should NOT SHAKE THE STEERING WHEEL AT ADLE. OK SOUNDS LIKE ITS RUFF UNDER LOAD LIFT THE HOOD AND CHECK FOR A HISSING SOUND IF SO IT IS VACUUM LEAK. MOST COMMON. iF TAHAT ISNT IT LETS MAKE SURE ITS IDLEING AT 800 RPM IF HIGHER PLEASE PUT ON FORM HERE AT FIX YA AND WE CAN WORK THIS OUT CHECK IDLE, CHECK ENGINE LIGHT, AND THEY ARE BAD AT NEEDING MOTOR AND TRANS MOUNTS MY BET WOULD BE ON MOUNTS

Feb 12, 2010 | 2004 BMW 3 Series

1 Answer

2001Pontiac Grand Am Rough Idle In Drive Only


I had the same problem with '99 GA I changed the idle control valve , solve the problem

Mar 23, 2009 | 1999 Pontiac Grand Am GT

1 Answer

Idle rough in R, D, fine in neutral


hmmm have you had the timing belt changed? is it due for one? that can cause a some rough idling.

Feb 24, 2009 | 1999 Mazda 626

2 Answers

Rough idle


Mercury had a recall on 3.0 duratech motors in 2000 and 2001. If you get a fuel smell at startup then you might have a bad lower intake gasket, it could cause a miss if seal is cracked. Article No. 01-4-3 you can get it on AllData.

Also, check the PC rubber L piece that runs from the PVC valve to under the throttle control - it could be busted.

Make sure ignition wires are not cracked. If you haven't tuned it up in over 30-40K consider doing that.

Feb 03, 2009 | 2001 Mercury Sable

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