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

Possibly a sticking IAC (Idle Air Control) .. Vacuum leak wouldn't care hot/cold/on throttle/off... Either the IAC is being commanded to open which it typically is briefly at throttle application to allow the computer to control engine decell preventing the engine stalling... If the engine idles normally before blipping the throttle try unplugging the IAC & blip the throttle... It may stall since the computer won't be able to control the return to idle but if it at least returns to idle you'll know your looking in the right area..