Question about 1999 Pontiac Grand Prix

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I have a 99 Grand Prix GT 3.8V6. For a month now it's been surging and stalling. Changed Fuel filter, Fuel pressure regulator, Theromstat and ignition coil. Cleaned a couple of sensors I can't think of right now and had the recall part fixed so it won't catch fire. After all this it's still doing it. I have an oil leak at the valve cover gasket. MAF Sensor has not been changed nor the crank shaft sensor. What can it be that's causing this problem.

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  • nebdclark May 15, 2009

    It has been thoroughly cleaned with MAF cleaner....any other suggestions before we replace the MAF sensor itself

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I have had similar problems with other model cars in the past. One time it was a knock sensor needing replacing. The other time was O2 sensor. Both gave similar symptoms as you stated, especially when it was the O2 sensor.

Good luck.

Posted on May 23, 2009

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Clean the MAF w/ carburetor cleaner, then let it dry.

Posted on May 15, 2009

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I had the same problem on the same car. It was the crankshaft position sensor and the spark plugs and wires and that fixed my problem.

Posted on Nov 20, 2009

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I replaced the MAF and fixed it

Posted on May 30, 2009

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