Holley sniper EFI motor suddenly revving uncontrollably when I blip the throttle

Things to cause fi idle surge...
IAC commanded to open because the o2 doesn't read enough air or is on it's way out
Popped intake gasket ,maybe from a intake backfire ...aka vac leak
Check the throttle shaft on the throttle body maybe there's a seal maybe the spring tensions too much and bushings worn see if the shaft slides or shifts at all on the bore to create a leak that would be sort of intermittent