Random misfire

Asked by Sep 14, 2017 at 08:24 PM

Question type: Maintenance & Repair

I have a 2003 Pontiac grand am 2.2L ecotec. Code
is popping up a a random misfire. Changed plugs
and boots, fuel filter, injectors and ignition module,
and new cat cause that code popped up as well.
Cat is good and new. Still misfiring. Can I get
anyone's knowledge.

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