with the use of ficd, u need to disable the original ISC....
im using 2 ficd...1 for cold start and another one for ac.....because my car isc went crazy idiotic setting....now worn gear..no check engine light, tps voltage setting was correct....but acting weird when morning cold start works fine...then alter 20mins trip or 30mins trip..stopping at traffic light, the idle speed will increase to above 1200rpm.... sometimes ok..sometimes not....so i locked the isc to predetermined setting, remove the gear linking isc to the stepper motor...then put 2 ficd..problem solved...now i got manual cold start choke and ac idle speed control..which both i can manually fine tune with just screwdriver
(*i'm a manual man)