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  1. 99 Suburban P0300 codes

    Chevy Suburban Forum (GMC Yukon XL)
    So a few days ago I went to start up my car and it was running about as good as a beached whale running a triathlon. So i used my code reader and got 2 P0300 codes which is random multiple misfire. I looked up the causes and parts that could fail (most of the parts on my engine are original) and...
  2. 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...
  3. P0300

    Chevy Silverado Forum (GMC Sierra)
    2008 Silverado 5.3 V8 with AFM with 180,000 miles Current issue is flashing check engine light with code p0300, snap-on scan tool reading missfires on cylinders 1, 2, 4, and 7 Before current issue the truck had slight lifter ticking sound and white smoke upon every start up which would go away...