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  1. #1

    Default Engine miss at low RPM, please help...

    My 2005 4.8 automatic with 102,000 miles has developed a miss or "skip" whenever I'm lugging around trying to save fuel. Most noticeable around 1500 rpm's when I'm in OD and the torque converter is lockout out. Apply more pedal and it stops. We hooked a computer to it and it showed cylinder 2,3,4,5,6,&7 randomly misfiring. I'm thinking new plugs, not sure if they have ever been touched, might add wires while I'm at it. Any comments or suggestions? No engine light and no faults are shown.

  2. #2

    Default

    I would start with a tune up(plugs and wires), also you can check for a vacuum leak around the intake plenum gaskets. I would recommend using delco plugs

    2003 Z71 Silverado LS
    Access roll up cover
    Bed Rails
    Billet Grill insert
    Bed Rug
    CB with PA system
    Waiting to be installed
    Two 8in RF HX2 punch( would have 12s but they got stolen)

  3. #3

    Default

    Well, I lost my tranny on the way home, and weirdly it seems to not miss now after I had it rebuilt. Could this possibly be related?

  4. #4
    Sr. Engineer
    Join Date
    Dec 2011
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    Default

    Could of been torque lock up ..in ..out felt like a miss.
    Sure was a quick rebuild ?
    RESIDENT NUT.....MY CLAIM TO FAME .....

  5. #5

    Default

    Would that send misfire reports to a scanner? Yes it was quick, dropped off Thursday am, picked up Friday pm, caught the shop at the right time.

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