Logging TPS using a scanner has yielded very strange readings! With just the key on, TPS starts at 29% & goes up to max of 87% only with the pedal fully depressed! Throttle body kept ceasing whenever the pedal gets fully depressed throwing the throttle codes in the process (P1516, P2101). After the throttle body ceased, I kept logging the pedal alone & it seems to stop at max of 82% only with the pedal fully depressed. Note, if I prevent the pedal from going all the away by as little as 1%-2% the problem won't occur & the throttle body won't cease! The engine, controller, harness are all brand new purchased for an engine swap project.I'd really appreciate your help

thats exactly what I was going to say. Very common with drive by wire swaps. Usually you need a pedal out the same car, in this case a zr1 for it to work.

Plenty of people have those stock TBs laying around. Ask someone to send you one and swap it. If you still have the problem then it’s the pedal. That code means there’s a difference between the throttle blade position and the throttle pedal (beyond acceptable limit)
Ive also seen water getting in the connector at the TB cause this, try some wd40, then dielectric grease, and a battery reset first. But if I had to bet I’d bet it’s the pedal.