Hey, I know the TPS subject is a rerun but, I finally adjusted mine on my '04 450 and the stutter is way smoother. I removed my TPS during my first jet change by accident and when re-assembled ran very rough. I ran it disconnected and got it pretty good by jetting but it still stuttered. I finally adjusted the TPS to about.74 volts and It runs much smoother (street). One of the things preventing me from adjusting was I couldn't get a voltage reading off that TPS connector. I finally shoved some safety wire into the plug and I got a reading.