[GTS 5.7]

Cleaned out the IAC,ended up needing a new TPS,but I learned a thing or two while trying to get my idle like I want it...do a search to figure out the proceedure,or: http://www.muscularmustangs.com/idlereset.php

My problem was I wanted to idle around 750-800 RPM to get the lopey sound I was expecting from the F303 cam...I could get it set,then after driving a bit it went back up to 1000-1050 after it warmed up ..now I don't remember seeing it ,and now that I've said that everyone else will point it out-but I always set it with the engine cold.So,I tried the procedure in the link,after the engine was WARM-HOT.Now it's a little "cold natured"-but it doesn't take long to warm up,but now I've got what I wanted ---FYI----

[87stang 5.0]

arnt you supose to change the base idle with an allen wrench, under the white plug on the throttle body for sn-95 cars, thats how i change mine

[GTS 5.7]

Could be,but my TB has a screw up top,not covered--and I guess I got excited and posted the thread too soon..after a couple of heat/cool cycles I'm bacK to idle at 900-950 with A/C on and 1000-1050 with A/C off,but it still doesn't act like the cruise control is on when I let off the throttle-so I'm not "just right" for my taste,but not so bad I can't live with it..will keep y'all posted as it developes

[GTS 5.7]

Tried it again-now after driving it enough,I think I can say it's where I want it..A/C on-700-750RPM,A/C off-750-800RPM...and with the F303 cam,off road H-pipe and flowmasters I've finally got the "Old timey" sound I wanted