[BR3W CITY]

Does it throttle-check when you go key on? (the click-click that you'll usually hear)

What are you monitoring this on? Using HP Tuners you should be able to watch what the TPS is seeing in raw output. If your pusing down 2/3 of the way but getting 20% throttle, then either the TAC, Pedal, or TB has an issue OR something in your tune has been modified.

If your only using a simple scanner or scanguage, try getting it on a dealer TacII or having your tuner run it in VCM Scanner so you can see what its doing or log the TPS functions.