Rsx tps sensor problems?

I bought an 03 rsx type s wrecked in the front. I restored it to almost mint condition however I'm having problems with my tps sensor. It got crushed during the accident and so I went along with putting a new tps in. Check engine light is still on and showing faulty tps, and it buggles and almost stalls for 2 seconds and picks up power again. And why are they mounted with headless bolts?