I too installed a tune via EFIlive from the tuner depot in october. the tune was written over a H&S tune after my original tuner was stolen. Now my truck starts hard and idles ruff. I also dont get my cold start preheat. I was starting to wonder if i had bad fuel or my injectors were due but it happened post tune install.

so this tells me i need to take it to a dealer and have it flashed stock and then reload my my EFIlive tune?