Lou jr

Hello everyone, new to this forum and in need of some help and guidance… I have a 2001 c3500hd with p1220 & p1221 and with the dreaded REP on the dash! replaced the throttle body due to a p1516 but no longer have that code. I’ve changed the tps sensor and app sensor. Although I changed the tps, I checked the voltage on tps1 & tps2… I noticed that I got diff readings on tps1 at WOT… Idle….and closed.. but when I checked tps2, I just got one reading through the movement of the butterfly…. what should the tps be reading??? Any help would be appreciated