Stalling Problem Aac Valve`?

[JapanDyno.com]

hi guys

need your help

over the winter i have done quiet a few mods on my R33 RB25 car

like power fc , 550cc, Apexi turbo, external, pump etc

on the start the car was running really bad pendling between 0-600rpm

i found out it was because of the oil catch tank and after blocking the small hose from the head going back the the plenum this was fixed ( i think)

the car was fine for a few minutes at about 750rpm after warming up the rpm dropped to about 450rpm engine running very quiet and smooth

after stepping on the gas up to 4000-5000 rpm the engine is reving fine but on the way back to down engine is stalling straight to zero tuck a short drive with it but the engine is always shutting off when i push the clutch pedal

otherwise the engine is performing fine...

i heared about a AAC valve what needs to be cleaned sitting on the plenum could this be the probleme ?

Please let me know im thankfull for any help

please ignore my spelling and gramma =)

dino

[R31Nismoid]

Could be the AAC - could be ATMO BOV - could be AFM