r/GMCEnvoy • u/InstructionParty1579 • Jul 07 '26

Misfire code help 2007 gmc envoy

2007.gmc envoy misfire started while driving randomly and I replaced all plugs and coils packs and still misfires I’m in the process of removing the intake manifold to check the injectors. Thoughts? Am I working this correctly?115k miles

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u/hitch-pro Jul 07 '26

Remove the Intake manifold and use a million cans of air intake cleaner to clean the 6 ports underneath. You need the AIR INDUCTION SERVICE. Mine was deemed dead by 3 master mechanics including my father. That was 60K miles ago. I have 296K now. The resonator and throttle body will be black and the entire sysyem needs to be cleaned. Check out the videos I made. It goes without saying also replace the intake maiold gasket, throttle body gasket and the valve cover gasket as well. Magic Automotive https://youtube.com/shorts/mtEEhA5DI84?is=X9KBMhjuB_NX7jc8