Random Missfiring
#1
Random Missfiring
I have a 03 f150 xlt with the 4.6, started idling hard and cel came on. Pulled the code and it said misfire in cylinder 8 so I bought some lucas oil gas treatment and after a few days the shaking stopped and the cel went on. Now its back and even worse, saying I have random misfires in cylinders 2, 7, 8. pulled the spark plug and cop on cylinder 2 and they both look in good shape. Does this mean its a compression or injector problem? Also the rough idling will come and go randomly while driving, and almost stop in the mornings when I first start the pickup. Any ideas? I'm really at a lost here and don't know much about these triton engines.
#3
Just recently bought this pickup so Idk about the fuel filter, but its been about a week and a half since I've filled up with the lucas treatment at a stinker station if that makes any difference.
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#9
Changed the fuel filter but it's still running rough. I noticed the EGR Pressure Sensor was damaged, one of the attachments for the vacuum lines was busted and the vacuum line was just floating around in the engine bay...could this of caused the problems I've been having?