need help with idle issue.

[94turbosubi]

ok so her it goes. when im driving my car down the road if i drive granny style and dont take it above 2500 to 3000 rpm and dont boost then come to a stop. when i stop the idle is fine. but when i do just the opposite and boost then come to a stop and push in the clutch when the rpms come down and like studders at 100 rpms.sometimes it will just go down then come back up to reguler idle speed which is from 700 to 800 rpms which i beleive is correct. but that rarely happpens. but usually it just goes down and studders like i said at around 100 rpms and almost shuts off. and has shut off twice so far. so to prevent it from stalling when i push in the clutch to come to a stop i take and tap the gas and rev it to like 1500 to 2000 rpms and then it just goes to normal idle and gives me no problems. but i dont want to have to do that for the rest of my life. and i also get shitty gas milage and i think thats just because of the problem it has. so far i have check for vacum lines. which there are millions. i could possibly have overlooked one thts hidden under the intake manifold. subaru also had a stupid idea with the way the spark plug wires connect to the coil pack so i to and spred the inside of the wire out to it would push harder against the inside of the coil pack. i have made sure they are all connected down at the plugs so i eliminated tht. i have also heard the iacv (idle air control valve) could be the problem. so i took it off and sprayed some pb blast on it which i heard works. that didnt work. i have no more ideas and would really appreciate any info you guys could give.

[magicmike]

I suggest you delete your other 2 posts in the other sections before a mod reams your ass. This belongs in this section.

Check for codes then get back to us with a list of codes. Then we can continue.
http://www.surrealmirage.com/subaru/engine.html

[douglas vincent]

Any codes? Does the CEL come on AT ALL EVER? then go away?

Knock sensor issue possibly.

[94turbosubi]

no lights nothing

[wtdash]

When was the last tune-up?

I used brake cleaner (something that leaves no residue), not PB Blaster to clean IAC- . Used this procedure posted by Ciper, which helped a little:
Remove pcv valve
Remove top (electronic portion) of IAC
Remove hose for the IAC at the intake side
Fill hose with plenty of carb cleaner, while turning the valve
Fill the tube again and this time blow while turning, air and cleaner will escape through the PCV valve hole <didn't on mine>

Repeat as needed. You should feel ZERO drag when turning the valve <only moves half a turn> Reassemble and try it.