Minitruck not idling down.

01 s-10 4cyl 5spd, starts idles fine, I drive for awhile, then when i stop the rpm's don't drop to idle. it drops to about 2000 rpms. sometimes i can pop the throttle about 3 times and it will idle down. most of the time that doesn't help it just started this intermittantly, no vacuum leaks, no obvious probs jump out at me, any input?

MIGHT BE THE THROTTLE POSTION SENSOR SEE IF THERE IS ANY CRAP IN THE ELECTRICAL SOCKET HAD THAT HAPPEN TO MINE