Here are a few things to look at.
1. Check to make sure the TPS is facing forward, not backward.
2. Check to make sure that the screw isn't screwed in pushing the butterfly valve open.
3. Place a LITTLE bit of grease around each side of the post where the butterfly valve goes through the body of the TB (inside and outside) and move back and forth a bunch of times. Wipe any excess grease off before turning your car on so you don't suck that into the engine.