The long hose running from the IAC -> check valve -> intake elbow
also you think about the vaccum from the supercharger in the intake elbow were the iac valve line is tapped in
kind of a lot the Idle valve has to overcome
When we deccel we get a droop in idle, some of us almost to stall out
When i look at my data logs, the Duty cycle of the idle valve is "twitching" from open to close in idle.
Really not 100% if this is the soul reason why, but it could be possibly or at least contributing to it.
Either way, The long hose just plain gets on my nerves, its wedged in between my headlight housing and scrunched over my brake lines
My idea is to just delete the line, put a check valve directly on the Idle valve port and then a small filter
so it cant leak boost, or breath in dirty/contaminated air
Here is a stupid little picture I drew, you see the current set-up and then what I think i might try