I'm stumped here. Have been doing some tuning on my 07 corvette and all was about perfect and at once the trims were crazy in the negatives. I even just last put everything back to stock other than I have the rear O2s turned off cuz I have my wideband in the rear O2 hole. it runs fine but if somebody could look at my log that would be great. Oh I also tried 3 different MAF sensors thinking mine may of been bad but it didn't change. I will say lastnight I noticed that while at idle it was horrible rich on the trims as well but this morning I flashed another tune in that I had and went for a drive and all was good. Was good all day then after a minor adjustment on the PE table and flash it went stupid again. Drove 20 miles with the LTFT reading near -17 or more. Could the ECM be messed up from too many flashes possibly?