04 pontiac grand am GT backfired now idels rough what could this be

Asked by Jul 24, 2016 at 10:51 AM about the 2004 Pontiac Grand Am GT Coupe

Question type: Maintenance & Repair

Went to start that car and it sounded like it backfired.  Now when it turns over
it sounds and runs rough.  What could this be?  Any help would be
appreciated!!!

1 Answer

71,025

Did it backfire out the tailpipe or the intake manifold? Either way it sounds like it's misfiring. Is the check engine or service engine soon light flashing? If so, it's definitely misfiring. HTH. -Jim

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