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all plugs were black and dry, plus i have no oil pressure , when i start too drive, speedometer is stuck, gas still getting into oil. i change the plugs @50000k before , then know at 70000k. ???????????????

how do u narrow it down to find the bad injector?

i got a problem with my tahoe 5.3L 4wd, engine lite came on and it read 300-misfire, i change all plugs and oil and filter, code came back and still getting gas into oil, can it be my o2 sensors, can i disconnect them all for now tell i get new ones in, would this stop it from getting gas in...