Question about 1999 Pontiac Grand Prix
Check engine compression--all cylinders. Rockers may have been overtightened eliminating valve lash on some cylinders. I've done it myself at times. If compression isn't right, pull valve covers and see if you can twist each pushrod in your fingers when lifter is off the cam lobe. If not, reaccomplish rocker tightening procedure carefully.
Posted on Sep 09, 2010
Testimonial: "thank you. i never thought about that. thanks. "
Check the mass air flow sensor,it is common on these and sounds like your problem!
Posted on Oct 12, 2010
If you are still haveing probs,check the oil pressure,with a manual screw in type oil guage if it is running too high it will pump up the lifters, and it will start running worse with valves not seating ,looseing compression. I had this problem on a 327 vet engine years ago.
Posted on Sep 11, 2010
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Posted on Jan 02, 2017
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