Question about 2004 Chevrolet Silverado 1500 Crew Cab

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2002 1500 rough idle wont go over 35 mph service engine soon

My truck is idleling rough has service engine soon and code po300 and i changed plugs and wired after that and did not help need to know where to go from here

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  • dink21 Mar 06, 2009

    what do u need me to clarify

  • carhob May 11, 2010

    had same code with my 98 jimmy friend of mine that owns a garage told me that my crappy spider inj.syst.was the problem and told me to take off ,clean it or swap it,so i change my fuel filter,put 3 bottles of lucas inj. cleaner in quarter tank of gas,give it aride next day was better,problem went away ,its been a month

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Have you O2 sensors checked out. I have blowen out 2 on the same bank, sounds like the same problem. Check engine light will stay on solid, blink for a while, solid. Surefire way to check is run your finger in the tailpipe after it is cooled down. If it is very black with soot, then it probably is the O2 sensor.

Posted on Mar 19, 2009

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