bac valve?
 

Hey guys I can't get my FC to idle I've tried everything. The compression on each rotor is good my MAF is good my TPS is where its supposed to be. It just dies if I don't keep the rpms up lol I'm out of ideas. My BAC isn't connected n I've read that many people don't run with a BAC valve its just for colder months n all that but if ur BAC isn't connected to anything does it still control the idle with that screw?? Mines turbo BTW so that's normally where the idle adjust screw is instead of on top of the throttle thank u all in advance!!!

bac valve?
 

The BAC valve is there to help change the idle under load, if you want it to idle below 1000rpm, hook it back up

The BAC valve is how the ECU regulates idle. Naturally, the car won't idle without it.

Unless you do something silly like crank the idle speed up to compensate.

Reconnect the valve and make sure your TPS is within adjustment.