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

PRH said

If there is a PCV attached, disconnect it and plug the port.

If that solves it, and you want to retain the PCV system, replace the valve with a fixed orifice type.

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no pvc system, just a couple of lines from the crankcase going into a puke tank. They do both go through the intake manifold though. Vacuum leak is looking more possible. I need to borrow a smoke tester from someone.