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p0300

  1. Chevy Silverado Forum (GMC Sierra)
    New to the forum and at a loss. Starting with a 2000 Silverado 5.3 275k never had an issue till about 2 months ago..started witha couple hard starts..then subsequent engine light indicator. Put an obd on it and got a p0300 random misfire. Changed plugs and wires since they were probably due...
  2. Chevy S10 Forum (GMC Sonoma)
    Hello, I am having issues with my truck and I need help. I have a 1999 GMC Sonoma and it is misfiring bad. I was reduced to a part swapper and spent loads of $$ like an idiot to no avail. The truck has new spark plugs & wires, new injectors, injector harness and fuel filter, and I also put on a...
  3. 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...
  4. 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...
  5. 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...
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