re. UNCONTROLLABLE IDLE....HELP!!!!

[Swann, Benjamin R. (BSWANN)]

Another Failed WOT/idle Throttle Body Switch ( or lack of power to it).

[I just had the weirdest thing happen to my 87 5kcsqt, while driving home =
last night exiting the freeway, pulled up to a stop light, noticed the =
car is idleing at 3000 rpm...try to kick the throttle down...maybe its =
stuck...nope. So I wait until this morning to check and see if the idle =
screw has worked its way loose....nope. Checked all hoses(visually with =
a good feel) to see if any are cracked to make for a vaccum =
leak....nothing....checked the throttlebody to see if it's =
sticking....nope....checked the throttle cable to see if its getting =
bound up....nope;(. The Idle screw seems to have no affect at all!]