[spudz]

I work at a Chevy dealership... I see this all the time... its usually with people that has a k&n air filter. They over oil it and the oil contaminates the MAF. Nothing you can do but replace it. BUT!!!!!!!!, does the truck seem like it has less power? I have seen MAF codes throw because of a clogged catalytic convertor and that will definatly cause a random missfire. Your coils and wires are fine. Delco plugs are the only ones to ever run. They are good for 100k plus.