Some of you may know what my problem was but here is a little background if you don't. 2000 f250 2wd 7.3, 214,000 miles. Mods I've done- hutch, harpoon, 6637, foil delete, 4" down pipe 5" back to stack, fuel plunger delete, new driver and passenger uvch, ccv, new idm and ecm. Ok the problem was loss in power after 3rd gear checked fuel pressure and 65psi at idle Ford cps. I had a bully dog gt tuner I took it off and sold it. Truck runs alot better now with no loss in power after 3rd. But will it do the same thing to me when I put the dp tuner on my truck. And could have the bully dog caused my issues.