I have a lly 04.5 duramax and I put on a bully dog gt tuner and everything works but no power increase. I called bully dog and they went through it on line and said nothing is wrong with it and I bought it new . They said that I probably have a problem with my ecm or clogged fuel system . I changed the fuel filter and ran some fuel cleaner and took the truck in to a diesel shop no one can find any thing wrong with my truck or the tuner. Any body run into this ? Or no Wat to do next .. I have other bolt ons on the truck also and I have noticed a difference with those bolt ons . So I think it is the ecm or tcm. Help!??