I had a cap cross fire between #2 and #4, those 2 cyl weren't firing and threw code 300. Replaced the cap and rotor. Cured the big no firing problem. But light returned in a couple days. Was still misfiring, felt like the engine would buck a little at operating speeds, never hesitated or missed through the accleration to highway speeds.
Replaced wires, no change. Replaced plugs, no change.
Took into shop, they ran in on a snap-on computer, told me that it was misfiring,(knew that much)and rerouted coil wire. (they said the coil wire was wrapped around the trans dip stick and was causing the misfire).
Was fine 4 days, then code and light came back on.
Took the truck to a buddy that had a snap-on computer and went for a drive, found that I'm having a misfire on #1,7,8.
Would have bought off on the coil wire BS but you'd think it would miss on all 8 and not just on those 3.
These 3 cyl are beside each other on the cap, it there anything I'm missing or not thinking of?
Edited by AMiller, 06 December 2003 - 07:51 AM.