Question about 1999 Pontiac Grand Am GT

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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 onto the highway or up the hill. It does it when the car is cold and warm. Help!

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  • Pontiac Master
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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.

Posted on Oct 12, 2010

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