Question about 1994 Pontiac Grand Prix

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Rough idle I just got a 1994 grand Prix from my father inlaw. He said it ran fine once in awhile it would run funny. Its not a tick or a knock it sounds almost like it has a hole in the muffler. But its only when its cold. We know we need to put a thermostat in it as there isn't one in it. But thats not the problem. He replaced all the spark plugs and wires etc. and it never helped. He seems to think it could be gaskets. But my husband says NO its not a gasket. He's not here right now for me to explain it any clearer then when I have written.

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Some times , the egr valve will hang from carbon causing it sound like ahole in the muffler when snap the throtel try tapping the egr vavle with the plastic end of screw driver or remove the egr and clean out the carbon and replace the gasket

Posted on Jan 21, 2009

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