Question about 1999 Pontiac Grand Am GT

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99 grand am v6 runs great then dies, driving and at idle. within seconds of starting it or even after driving for 45min. rpm gauge jumps up and down and hesitates when accelerating. no engine light, replaced crnk shaft sensor, plugs, tps, fuel regulator and filter, clened mass airflow and throttle body, got tips from lots of you but nothing has fixed it, HELP!!!!!

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Autos can be frustrating! I call it ghost in the machine...After all that, I would check the pressure at the fuel rail. My mother's Volvo turbo acted similarly and it was because of a worn fuel pump that was regulated electronicly. After 2 Volvo techs spent an hour on it + test drives, they told me that my diagnosis was correct, the fuel pressure at the rail was intermittently eratic and performed normally most of the time. No problems since the replacement 2 yrs ago. Let me know if you make progress and I'll check with my neighbor who has one and drag races as a hobby...MK

Posted on Oct 02, 2010

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