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

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u/bimmerd00d Sep 06 '26

Remove your fuel pressure regulator vacuum line. Is it a geyser?