Mechanics

ENGINE RUNS ERRATIC THEN RUNS FINE

1999 Pontiac Grand Prix

Engine Performance problem
1999 Pontiac Grand Prix 6 cyl Two Wheel Drive Automatic 145000 miles

This car all of a sudden started running erratic then it will idle fine then back to erratic I have tried 2 seperate scanners they will not link with PCM I tried the scanners on my other vehicles and they worked fine I have checked all fuses and they are good possible PCM I have also checked all connections and they are tight.
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Wmccay
June 8, 2010.




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