Your car's stalling because your car is not tuned for the SSQ because its not plumback... its atmospheric. Your car will now run more richer with the SSQV on. If you want the blow off valve on, you will need some sort of piggy back ecu.
To get the flutter on your car, block your blow off valve with a peice of metal which is the same shape as your stock flange. When i first brought my skyline i did that and i got a flutter, but doing this is no good, i do not recommend this for you buddy.