2003 Denali Random Cylinder Misfire


fenixtx999
01-20-2008, 02:27 PM
I have a 03 Denali and it has a random cylinder misfire. it has a P0300 code, which is random cylindr misfire. it misses on cylinders 2,4,6, and 8 often, and rarely on 3,5,7, and never on 1. I have replaced the plugs and wires, and had the injectors cleaned, and it hasn't changed. the mass air flow sensor is good, and the only other thing that I can think of is the computer, or else it has bad coils on 2,4,6, and 8. any thoughts?

master1printer
03-12-2009, 11:55 AM
cam position sensor

fenixtx999
03-12-2009, 02:38 PM
thanks for the reply, i checked the cps and it was good. i figured it out though the catalytic converters were plugged on both sides and causing it to miss, i replaced them and the problem was solved.

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