2006 Hummer H3 3.5L, 5 cylinder, Base.
Error Code reads: Code P0304 indicated that cylinder 4 had too many misfires within a predetermined period of time.
Here is a video on how to fix this problem and never worry about it again. Instead of just fixing that particular cylinder, I went ahead and just fixed all the cylinders at once. From the spark plugs to the ignition coils, everything is in one spot making it easy to replace.
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Cut the music.
Please take this as constructive criticism but that video was of poor quality. The content was good but the voice volume was terribly low and the music volume was excessively high. I'm betting a lot of people clicked off on this in a hurry because of that.
Bet you had rough idle after that repair! It looked to me that you forgot to reattach the PCV hose under the resonator box.
Thank you for this!!