Sigh idle issues

[TSITurbo95]

Ok so ive been battling this damn idle issue for ever. Some days it idles perfect, next day it will idle high, so I adjust the biss, get it good. Couple days go by and its too low, so I adjust and yadda yadda yadda.

Its a never ending battle. I correctly set my ISC (yes it works), yet it still somehow is never enough. I put my fiav back on to help with cold starts to stay idle, again, works when my idle is perfect.

Anyone have any suggestions? ISC works, no boost leaks (figured that would be high idle).

 

[dsm4fox]

Just outta curriosity, do you have any recent comp test numbers?
Does it have a hard time starting by any chance?

 

[TSITurbo95]

Compression is perfect, and not at all. Ive always had this issue, old motor and new.

 

[dsm4fox]

might be a long shot but i had a 1g with a transistor inside my ecu for the iac that was all messed up and caused that crap.. fixed it, idled fine after.. just an idea..

 

[92AWDHX40]

start here Terry's Talon Troubleshooting Tips #3 - Fast Idle (aka. Idle Surge)