replaced parts and still the same no power and rough idle
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1999 Pontiac Grand Am Question: had replaced all coils,ignition mudule,and plugs and still have mutiple misfire.
Answer #1Chevy Power August 02, 2012, 10:28Journeyman
Sounds fuel or compression related. Have you checked compression or performed an injector drop test?
Answer #2ziptie12 August 04, 2012, 23:22Master
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.