I had the same stalling issues, eventually it resulted in the check engine light coming on. The local Ford garage tried to get me for $707 for a new throttle body and install. Upon removing my throttle body there was significant sludge underneath the butterfly valve.
The only issue I ran into is that I twisted/snapped the head off on of the T20 screws that held the TPS in place, but a quick trip to True Value solved that issue. Otherwise it runs like a top again, even the idling at stop signs/lights is better.
Can't say thanks enough! If you're ever in the Pittsburgh area on a Friday Night, drop me a line, Lernerville Speedway VIP treatment on me!!