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  1. W

    "engine power reduced" with no engine light or code, possible tuning issue?

    I just bought a stock 2009 LMM everything was running fine, I just deleted and tuned it about a month ago. Right after the tunes were loaded and the truck was running I noticed it wouldn't accelerate very quickly like there was a lag. if I floor it the RPMs don't go over 3000 and it smokes black...