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Thread: 02 Yukon P0300 and bad running

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  1. #1
    Join Date
    Mar 2007
    Exeter, Ontario
    Time Online: 2 Mths 1 Wk 2 Days 14 Hrs 25 Mins 39 Secs
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    02 Yukon P0300 and bad running

    Friday I was out on lunch in my '02 Yukon. As I was returning to work I tromped on the gas and my truck fell hard on it's face, shuddering, bucking and barely idling. Through a P0300 random misfire code.
    Thought it maybe an intake manifold leak but carb cleaner hose down didnít find any vac leaks.
    Any ideas where to start before I bring it in. I would probe myself a little more but just don't have time and I need it diagnosed as I need my truck.
    90 YJ. 4link F/R, 16" SAW Airshocks, 32bolt Beadlocks, D60/14bolt, Full Hydro/Hydroboost L67 3.8SC 700r4 NP231/D300
    02 Yukon XL on 37's DD
    91 Cherokee Juggy scrapped for Greener Grass
    I prefer to build it and not buy it, you see it, I probably made it.

  2. #2
    Join Date
    Jul 2004
    selkirk ont
    Time Online: 1 Yr 3 Mths 2 Wks 5 Days 9 Hrs 35 Mins 35 Secs
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    had the same thing a few weeks ago, ran some lucas injector cleaner through it and it cleared up

    2004 rubicon: 12,000 lb titan winch, 35" goodyear wranglers, staang's belly-up skid, cobra 29 cb, highline fenders, trailhead bumpers

    VA3 HWG, OF4WD #5571, RETREAD #1

  3. #3
    Join Date
    Dec 2004
    Time Online: 9 Mths 5 Days 19 Hrs 58 Mins 19 Secs
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    Google-fu forum link says MAP, MAF, plug, wire, injector or fuel pressure regulator on driverside fuel rail. Easy enough to check all
    97 TJ - The Build
    77 J10 - Death Proof
    11 SRT Challenger with some stuff
    05 Duramax

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