problem is your intake IAC passages are now full of sludge. and you adjusting the throttle to "fix" it will for a while and in this weather. as soon as the da changes so will how it idles.
Essentially regardless of iac position. if the passages are plugged which can happen on an old 1993 intake. then the computer has no control over the idle. So id say take the intake off and check the iac passages. there are 4 threaded plugs on the bottom of the intake. take them out and run bailing wire or coat hanger threw them to clean them up. and then a good spraying of intake or brake cleaner. and that should do it.
what tipped me off was that with both the stock and the aftermarket tb's you are still having issues and now after moving the throttle blades(wich should have little effect on idle unless you go too far and over shoot the idle and TPS readings). it now idles ok. thats my guess.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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