alright guys here's one. last night i set the tps and idle of my car. i also replaced 2 check valves (double throttle diaphram & the one under the tb) i replaced the check valves 2 days ago and i thought the problem was fixed. today it did it again. when i step on the brake, the car drops in rpm. when i shift into drive, it drops further and sometimes stalls. any ideas?

ps. it idles at about 1200 in park. i overcompensated for the drop today.

 

alternator? maybe the booster is drawing too much?

 

booster?

 

BAC...compensates for power useage (ie. headlights, brakes, ac)...helps to maintain a steady idle, and when it goes bad, the idle starts to bounce like its gonna stall

 

is the booster a senor on the alternator? What is a BAC

 

The BAC is mainly for the P/S and A/C.

BAC = Bypass Air Control System.