I seemed to have fixed it. Truck is a manual I stuck it in third and floorboarded it. Was bouncing all over 3200-4000 then it stopped doing it. Very strange.
Having a problem with a 7.3 build. truck has 300/200 s467 twin hpops. a1000 with four corner feed. Tunes form two different companies. Under WOT itll like hit a wall at 3200+- rpm almost like dead pedal. Then a in a split second itll get back in it and do that same thing almost like it's banging...