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1999 Pontiac Grand Am Question: had replaced all coils,ignition mudule,and plugs and still have mutiple misfire.



graybeal, Orlando, FL, August 02, 2012, 10:59

replaced parts and still the same no power and rough idle

2 Answers
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  • Answer #1

    August 02, 2012, 13:28

    Sounds fuel or compression related. Have you checked compression or performed an injector drop test?

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  • Answer #2

    August 05, 2012, 02:22

    Any other codes besides misfires ? Any ability to read live data? Access to a vacuum guage--easy check for valve related problems often overlooked is with an old-fashioned mechanical vacuum gauge.

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