The TPS affects tickover but there are a couple of other things to check.
Enrichener cable routing can cause an issue on those models and can hold the quadrant in fast-idle position. This will likely show itself as the engine revving as the bars are turned side to side
Make sure the throttle stop screw (1) isn't holding the quadrant in an open position.
Also check the same thing for the master throttle adjuster (2).
If you haven't messed with it the balance screw (3) should still be in the right place.
The factory manual recommends setting the air bypass screws (10) right in and turning them out until you get 1000-1100 rpm tickover (approx 1 full turn out)
