Question about 1993 Pontiac Grand Prix

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Idle problem engine rpms go up and down at a steady rate. Sometimes dies at stops. Engine races for 3 seconds when I first start it, then idles poorly. It's a 1993 Pontiac Grand Prix with a 3.1 liter engine, mpi.

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  • kjack Aug 04, 2008

    i have a 1989 pontiac grand prix 3.1 motor replaced cyl head old one was cracked . it had a problem before it would loes power and it would die. and u cud not get it started. if u let it set for 2 hours it would start up and run.replaced crank sensor. now it runs worse. now power starts and idles rough. if u touch the foot pedal it stops.replced coil packs and ignition module. IM STUMPED HELP??????????????????????????

  • kjack Sep 22, 2008

    i still have the 69 grand prix it has a fuel problem. u can take air inlet tube off while its running and spray gas into the inlet and it runs normally replaced fuel pump and filter. wats wrong

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1 Answer

Throttle position sensor is what I replaced on mine. Could also be a short in a wire that controls throttle. That was 6 years ago and it was $100. Took it to a shop, that's all I got.

Posted on Jul 22, 2008

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