UNCONTROLLABLE IDLE....HELP!!!!

[Tim Sidders]

Hi all 
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!
    The only thing I can think of is.. a couple of weeks ago my mechanic, tweeked my fuel/air mixture so I could pass emmisions, was running too rich, leaned it out a bit ....haven't had it tested yet....then last week my fuel pump took a crap.. so I replaced it. I've checked for any codes that maybe stored., but nothing is coming up!! I really need your help gang, I haven't the faintest clue what this could be?????Thanks for any input in advance. 


Thanks 
Tim 
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