SR20DET Stalling in neutral/decel - IACV?

[lagvoid21]

I've been researching for over a week now, trying to avoid posting YET ANOTHER THREAD on this subject, but have given up.

When I first start the car (cold), the idle is steady and does not stall. Once the engine is warm, the idle drops to ~800 rpm. If I blip the throttle, the rpm's drop down real low ~500 and sometimes stalls. If I rev up 3k+ and let off the gas, it will definitely stall coming down. The engine appears to be running REALLY rich when it stalls. I can't start the engine back up unless I give it gas...


I am running a TD-06 turbo and it does not make any boost revving in neutral.

Here is what I have tried up til today:

-new plugs
-TPS voltage is right (.43 closed and 4+ open)
-dumped a lot of intake cleaner down tube to IACV
-dumped a lot of carb cleaner
-dumped a lot of seafoam
-tried decel-air setting on afc-2
-removed iacv to clean with degreaser (brake cleaner and oil eater)
-removed iacv again to clean with superclean
-disconnected battery to reset ecu in hopes of having ecu relearn
-sprayed starter fluid on couplers/vac lines
-checked for vacuum leaks
-adjusted idle (using tb set screw and iacv adjustment knob while tps and iacv disconnected)
-pulled vacuum off bov and plugged
-filled coolant

The IACV is adjusting when I turn the screw, however the idle drops too low and often stalls. Even with a blip it will seek around for idle and stall unless I very lightly hold the rpms and slowly let off.

740cc injectors
hks ssqv (open atmosphere)
td06 turbo
z32 maf
greddy intake manifold
nismo fpr
hks step 2 cams
enthalpy rom
safc-2 (no longer installed)

I never had this problem with a smaller turbo running the same BOV open atmosphere. Is my IACV dead? I was unable to find how I could test if the spring was working or if it was sealing properly when the unit was removed.

I really appreciate anyone taking the time to read this. Please help me!