Questions & Answers for: GMC K1500 miss firing

miss first? Check spark plugs and see which ones are firing correctly and which ones aren't. Did this vehicle ever overheat in the past? If so, that could be the biggest problem right there. If it did

...firing. im kinda wondering if its anything to do with the intake now? Does it miss at idle or going down the road, maybe both? Any applicable trouble codes? If you have that spider fuel system, I ...

idling #5 and #7 miss fire. holding it at 2000 rpms makes all 8 miss fire. its running really rich and the only code its showing is P0300 which is engine miss fire. have replaced plugs wires cap and ...

...required or does the throttle position sensor over rule.This happens at or about W.O.T. There is no missing or pinging and occasional back firing when going down hill.The spark plugs look normal,the ...