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  1. Need help!! 2001 Yukon xl Denali 6.0 p0300 code

    Chevy Suburban Forum (GMC Yukon XL)
    Hey all, going to throw this out there out of desperation. I can tinker on vehicles but I am not a mechanic by any means. Getting the p0300 code for random miss. I have replaced all plugs, wires, and coils before figuring out this code is misfire on random cylinders, so probably fuel or an air...