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loss of power

  1. Loss of Power above 75

    07.5-10 LMM Duramax Powertrain
    hey guys, this is my 1st post on here... i have an 08' LMM w/ edge CTS programmer and 5" back exhaust w no cat muffler or dpf. Recently when running on the highway at 65-75mph, when accelerating half throttle there is a big bog down of the motor and a rumbling sound accompanied by a small shake...
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