Originally Posted by heavyboost
But shouldn't it run on the other tunes? It will only run on the one. I'm trying to get it to a tuner shop but I haven't found any within about 3-1/2 hrs from my house. I've had a lot of modified diesel trucks and I could always change tunes around on them just fine. Maybe this doesn't work like that?
The stage 1 and stage 2 tunes are for the stock injectors. Running a higher-flow injector than a map was designed for will cause you to go excessively rich and cause all kind of driveability problems. If far enough apart the car may not even run. Definitely not good. I would stick with the map that runs well. You can go to the maps section at cobbtuning.com to see if the map name matches one of our stage 3 maps. If not, then the other possibility is (assuming the Accessport was included with the car you bought) is that the tune is a custom tune that the prior owner had done.