Idle resently started surging from 900-1300. Wanted to check were the BISS screw was set, and noticed that when I activate the SAS actuator the idle get REALLY surgy. No amount of turning the BISS screw(either way) makes it better. Along with this the AFR goes from 12 to 17. Could this be the stk O2 sensor taking a dump or iare the AFR swings due to the idle issue. I'm gonna pull the ISC out and check the impedance between pins. Maybe its bad..

 

Also make sure your Tb seals aren't leaking