hello, just got my juice with attitude installed and took it for a test spin. First off, Wow, what a difference. 7.2 0-60 times on level 4, I even broke them loose @ 45mph. Ran great, but after hot rodding a little bit that dreaded engine light came on. Disconnected tuner and waited a while and everything was fine. Reconnected and drove another while and same thing happened. Onstar diagnostic says fuel supply system is not working properly. Now I've got to completely take unit out and return to dealer to get looked at. Wonder what they will say about the drill and tapped exhaust manifold for the gas temp. probe? Pretty bummed out right now.