I am working on a 2015 1500 chvey with a TVS 1900with throttle issues.
Cruising around you ease into and it opens up, but right after it opens up, it gets closed back to 40%.
Ease into it some more goes up then back down to 40%
You can be almost full pedal and still at 40%. But once you go full pedal, it opens up and stays open.
Attached are stock file and magancharger file
stock tune - 2015 5.3.hpt
121214_2015_Sierra_5.3L_DI_E4769_T0599_TVS_3BAR_FG115150.hpt