Syncro is bad in second, replaced slave and master cyls not sticking anymore. Getting a trans this weekend.

As far as the idle goes, my BIS screw is broke off im thinking it was idleing high on a cold start and the previous owner turned the idle down and thats why when it warms up the rpms just sit around 400 dont drop or go higher... so I ordered a new bis screw.

Sprayed out throttle body
replaced IACV
put the egr block plate on
checked for boost and vaccum leaks
What else could it even be? MAF Sensor is bad?