[Dave Colangelo]

If I am not mistaken there is an allen head screw that you can access from the top of the housing, its on the side some where, I believe it controls the amount of air that flows though the small channel that goes around the valve. Try adjusting it and see what happens. Also make sure that if you removed the valve during the rebuild, when you put it back in it is seating correctly. I have had throttle issues because the valve is not seating correctly (in other words make sure that when it is closed all the way it is actually closed).

Regards
Dave