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  1. P0305 error after changing spark plugs

    Hi All! I a Verizon Hum that monitors for engine issues on my 09 Traverse and a couple of weeks ago I got an error P0305 saying that cylinder 3 was misfiring. All was good for a few days then the diagnostic code reappeared but stating that cylinder 5 is now misfiring. Any ideas on what I should...