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Intermittent misfiring
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Question
Paul Kendall
So I have an 03 Silverado 1500 4.8, I just put a new tranny in it, went to fire it up and take it for a test drive and it's all dandy for the first couple km, then it starts misfiring like an SOB, loses power etc... Getting a random multiple cylinder misfire code, but I'll drive along then the SEL with quit blinking and all will be fine for a couple more km then it's back to the misfiring. If I stop and sit for a couple minutes it will be fine. It is also fine when in park, the motor will Rev up with nothing out of the ordinary, held it a 2000 rpm for a couple minutes and no misfiring. Any ideas???
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