i have a 93 mr2 turbo w/ 100k miles. the car is in great condition but lately it seems to be getting worse and worse as far as throttle response and idling. for a while it was giving a problem where i would drive through any gear let off the gas and put it in neutral and the cars RPMs would just drop and the car would turn off. i figured it was the BOV and tightened it a lil more and it seemed to fix the problem somewhat. now the car is just always idling arond 500 rpms when warm and 700 when i first turn it on. i have no vacuum leaks and have no clue what it could possibly be...could the BOV be causing this? any info would be greatly appreciated thanks.

btw i have a turbo XS type-h