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engine hum

  1. Engine vibration/hum

    6.0 Motor problems
    I recently tuned my truck with a hypertech max engery to stage 1. After about 300 miles on the highway i noticed a hum and vibration coming from then engine when i pulled off to get fuel. Its only at low rpm and speed or idle. After about 55 mph or 2000 rpm it goes away. I've programmed the...
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