Engine miss at low RPM, please help...

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by Averitt, Mar 16, 2012.

  1. Averitt

    Averitt Member

    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. Z71_guy

    Z71_guy Epic Member 5+ Years 1000 Posts

    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
  3. Averitt

    Averitt Member

    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. dipstick

    dipstick Member 2 Years 100 Posts

    Could of been torque lock up ..in ..out felt like a miss.
    Sure was a quick rebuild ?
  5. Averitt

    Averitt Member

    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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