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3000 rpms

  1. Loud rattling noise/vibration at 3000-4500 rpm after spark plug change

    Engines/Performance/Tech Questions
    Hi everyone. I've searched the forums for this issue and I can't find my particular problem. Some background to the problem: Yesterday, the idle on my 2005 GMC Canyon 3.5 was super rough. I went through the motions: 1) Ran diagnostic, cleared computer, ran again. 2) Cleaned throttle body. 3)...