woot! my hunch payed off. i was sitting on the john thinking about my idle problem and immediately ran outside (after wiping and flushing of course) and i realized....my butterfly was backwards.
in the idle position, the butterfly sits at what looks like not a perfect vertical angle, but like a 91 or 92* degree incline, which diminishes to 0* as you open the throttle. well, since its sits at this angle, the rim of the butterfly was cut at an angle to sit flush with the face of the wall of the TB. Well while i was porting it, i took out the butterfly and ran my 180-grit over it very lightly (took that dull brown color and now looks like polished gold) and when i reinstalled it, i had it bass ackwards so it was completely wrong...thereby allowing more air in, throwing off the IAC. so i flipped it around, reset the computer and upon crankup...sure thing. she climbs to 650...700....750...790.... then i take it down the driveway and back and in neutral she sits at a modest 850 RPM. yay!
Scott, its okay if you don't believe me. i didnt do this to impress you. fact of the matter is i felt a difference and my other F-150 buddy drove my truck around and immediately wants me to do his now. I'm not saying im going to go out racing lightnings now. but if you want to chip some money my way, i'll gladly find another stock TB and drive to jacksonville and do a dyno for ya
and i dont have an "overheating" problem. with the 102* weather we've been having my truck is sitting at 205 degrees, but that is not a problem.