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I have a p0301. Have changed the spark plugs and rotated coils to rule them out.

(2009 Pontiac G6)
in Hampton, GA on January 11, 2014
What should I look at next?
Displaying 5 answers & 2 comments
Popular Answer
on January 11, 2014
Check for vacuum leak and injector pulse. Plug wet when removed? If so, check compression. Seems we have quite a following here, hope you get it fixed!
of G. T. Service Center on January 11, 2014
Try the intake induction service, Per GM Bulletin.
of Gillespie's Auto Service on January 11, 2014
When does the misfire occur? At idle? Under a load? Or all of the time? Is it constant or does it come and go?
on January 11, 2014
Just rotating the coils will not show up a miss fire, as it will just move to another cylinder. Try disconnecting one coil at a time when engine is running. If when a certain coil is disconnect there is no difference in engine missing, you have found a bad coil.
on January 11, 2014
It will change the misfire code if coil is defective and switched to another cylinder!
on January 11, 2014
I'd start looking at the injector or injector wire harness
on January 11, 2014
Boy i sure wish i had thought of THAT!!! Do you know what injector pulse is?
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