Quote Originally Posted by jameslleary View Post
I am experiencing this right now, in my case, 13psi causes idle surge, and inability to set minimum idle to 500rpm. my regulator (jet) will only go to 12.5 psi, and I can set everything correctly, and it will not surge, but, anything over 12.5' and the problems start.
it might not like minimum idle set at 500rpm. maybe too much air going through the IAC and not the throttle blades.