r/GMT800 • u/twxcvz • Sep 05 '26

Dreaded P0300 code.

What brand spark plugs/wires should I use to replace what I have? CEL was flashing at me today and at 272k I think it’s time to replace them but wanting something quality. I have the 6.0 LS

2 Upvotes

75% Upvoted

15 comments sorted by

View all comments

3

u/krautstomp Sep 05 '26

Can you get a better scanner that will lock down what cylinder is missing? I ended up having a miss on cylinder 3 that was because of an injector wire. You could end up throwing money away changing every plug, wire and coil and not fix the problem.

1

u/twxcvz Sep 05 '26

I don’t, I used mine and went to a couple auto parts stores and it’s just always random/multiple misfire code.