Recently I had to have my truck taken to the dealer to have the ECM reflashed with the latest and greatest from GM. Got my truck back and after excellent help from various members on this forum I was able to script the changes from my tow tune I had previously had with the old OS. After loading the tune on the new OS I could tell a slight improvement from stock running however it doesn't feel as strong as it did with the old OS. Any ideas, comments or suggestions?