i have a 1991 rx7 gtu. when i turn on my ac the cars idle drops very low and when i'm driving sill shut down if i take it out of gear. as idle drops will sometimes just drop to zero and die other times will almost hit zero then struggle back up to the low idle speed. i have my tps adjusted nicely. only one light turns on. also my car has a weird idle when i start up. it revs to 3k then drops only to 2k then as the car starts to warm up it'll start bouncing from about 1500 to 2000 until car is warm. once car gets to operating temp it it smooths out at about 1k and as i drive the car it goes to about 800. also when i push in my clutch the idle speed drops to normal.

hook a brutha up!! :P

 

sounds like (IACV) idle air control valve

 

Your TPS is out of adjustment.

You have a vacuum leak.

Your BAC valve may be sticking or bad.

 

Does anyone know where to get a BAC valve for a 87 TII for cheeper then 500 bucks

 

****..... i have the same problem. I knew i had problems with my bac and probably a vacuum leak somewhere but tps problems too?