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 smoke like crazy. It takes forever to accelerate when trying to pass anyone on the highway. I have the log but would need someone to look at it because I can't figure out how to post it on here.