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    One cylinder not firing

    Hi Guys, I have a 1996 GMC Sierra 2500 that started running rough and giving misfire codes. It mostly says cyl 4 misfire or random multiple misfire. short Fuel trims are high, around 30 on the passenger side bank. Strangest thing that although it says cyl 4 misfire, cyl 2 seems to be not firing...
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