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Jump and Clunk

Discussion in 'GM Powertrain' started by jnbama, Dec 12, 2011.

  1. jnbama

    jnbama Member

    2012 4.8 automatic 1000 mi. Twice this has happened , truck seemed to jump slightly when started. today a loose clunk sound when started will have some days off and plan to visit dealer
    Last edited: Dec 31, 2011

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