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

 

Question

graybeal, Orlando, FL, August 02, 2012, 07:59
 Rookie

replaced parts and still the same no power and rough idle

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  • Answer #1

    Chevy Power August 02, 2012, 10:28
     Journeyman

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

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  • Answer #2

    ziptie12 August 04, 2012, 23:22
     Master

    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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