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2006 2500hd 6.0 backfire misfire


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driving to work,at stoplight ,dies..restart stars backfiring,bad miss.limp home.p0300 code try to start ,crank no start.put some maf cleaner starts dies.went got chevron 91 octane and lucas fuel injector cleaner.started ,bad misfire.i let it run a while,seems to be better.took it around block died at stop misfiring.barley got home.cleaned throttle body ,maf,any suggestions?still missing bad .rail pressure 55-60...please help

 

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