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Hey guys, I just serviced my 1996 5.7 and now its throwing the P0300 code. But truck doesnt skip, stumble nothing, light is just on. I did plugs, wires, cap, rotor, coil, sending unit, the rear O2 sensor behind the cat is new as well. What could it be?
drive it for a while and see if it goes away. Try resetting it and see if it stays off. I can't remember how many driving cycles error free it takes to automatically remove the code but once it's there it takes a while to reset.
I reset it and it hasnt come back on yet, but it threw a P0430 code today. Something to do with converter i guess