Question about 1999 Pontiac Grand Am GT

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Ok I Have a 1999 pontiac grand am gt coupe. i have an engine sputtering problem when i am driving but when the car is idle it is running fine. what might be my problem and how can i fix this?

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You could have spark plugs that need changing or bad plug wires.the fuel injectors could be dirty not allowing enough fuel to be burned.at idle there isn`t enough load to cause a noticeable miss fire.

Posted on Apr 10, 2011

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My 2000 Pontiac Grand Am has been sputtering for a while, it has trouble gaining speed and will miss several times while driving. Once the RPMs catch it will gain speed, but it still misses. My ABS light...


This may be totally off base but my 2002 Lesabre with the 3.8 litre engine was running like this and it was the ignition control module. It is under the coil packs. The engine would start ok and idle ok but run like heck when trying to drive it. Are you getting any codes? Mine was random misfiring. The ignition module was about $150 and relatively easy to replace. Make sure everything is clean when it goes back together.

I don't know why the abs and trac off lights are going on and off unless there is a short somewhere.

hope that helps. if not repost your problem.

Apr 05, 2011 | 2000 Pontiac Grand Am GT

1 Answer

My 1999 pontiac grand am(v6) runs fine till you go to get on the highway or have to go up a hill then the rpms go up the car starts to fluctuate(**** or sputter) really bad were I wonder if I will make it...


my first though is a plugged catalytic converter. This can be checked with a back pressure gauge or by dropping the exhaust where it bolts to the back manifold and then test driving to see if the power is restored.

The second that is a bad MAF sensor. It is located in the air snorkel between the throttle body and the air filter box. You can try unplugging it and see if it drives better.

Lastly it could be as simple as bad ignition wires, plugs, or a coil.

Is the check engine light on? If it is the stored codes would give you some direction to start.

Oct 12, 2010 | 1999 Pontiac Grand Am GT

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check tps sensor check idle air control valve or iacv for proper func

May 03, 2010 | 1999 Pontiac Grand Prix

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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

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99 pontaic grand am


sounds lie you might have an IAC valve problem

Mar 08, 2009 | 1999 Pontiac Grand Am GT

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