Ever since I got my truck it's been having a slight missfire or backfire out of the exhaust but it's only when u first start it after sitting for a while--say overnight and it only does that until the idle goes down. (about 30 seconds or so). I have tried Seafoam about 10 times so far, changed plugs, and changed DPFE sensor. Help!
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Missfire/Backfire?
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