Boom90

s13 with a rb25 swap everything is pretty much factory...(turbo,injectors,coilpacks etc... The problem recently started but when I start it up in the mornings the revs are high sometimes.I'll turn it off & start it back up & it idles perfect...but recently if I'm driving & when slowing down if the clutch is engaged the rpms will drop then it stalls. It starts right back up but I've been having feather the throttle while braking. I changed the plugs like 4 months ago so I'm assuming that wouldn't be the problem. I've been thinking could it be the coils or possibly the aac valve needs to be cleaned...has anyone else had these issues thanks in advance for any advice?