I have Vance and Hines and k&n filter. Not sure what jets the mechanic put in. Here's the issue. It hesitates on initial acceleration. This really only happens when I'm spin slow speed drills where the throttle is all the way closed then gets cracked open. It jerks the bike like I really cracked the throttle. It isn't a bike deal if I'm going to go straight quickly, but it is very disconcerting when I'm leaned over in the middle of a 17ft u turn. Any ideas? Could it be the pms screw? Also, problem #2. My throttle doesn't snap back when let go. The cables were lubes 5000 miles and 4 months ago. It doesn't snap even with the throttle cable slackened up a little. Ideas? Thanks guys and gals.