weird idle?!?!?

[95 'clipse RS]

ok i have one of these problems i think... except my car on cold start idles 1500 then slowly edges its way to 2100 sometimes 2300, the times when it does reach that far it falls quickly to about 1300 then back up to 2100-2300. the idle isnt really sporadic though, it doesn't vary much at all.

ive checked the iac cleaned it, replaced it with one from a j yard to see if any difference at all and none. i aslo checked the egr valve and it seems fine. i pulled the code and its like P0505 i think, but i know it said it was in the idle air control system.

my car is a non turbo 420a, so...any ideas??

any positvie feedback is appreiciated
thanks for your help

 

[ALLBoostAWD]

not sure about the 420A engines but i would check the Air Intake Temp sensor, sounds like it doesnt know wether it is hot or cold.

 

[RedRain]

Try this: Ur throttle cable might be expanding once it gets hot or it might be getting stuck. Whenever ur idle gets high, try goosing ur throttle to see if it goes back down, if it does then it is ur throttle cable getting stuck.
http://www.dsmtuners.com/forums/showthread.php?t=160350

 

[95 'clipse RS]

well ok, ill give any thing a try right now. and i am pulling a cel, forgot to mention before. but where is that located on the manifold im not quite sure of everything yet. and i heard talk of a biss adjustment or somethin, could that be an issue??

thanks