I imagine it depends on the car, but I would think the pump would run as long as the key was on. You said you stalled it so I'm assuming it was still on.

Hmmm, weird. What did you spray it with? On a carbureted car I spray with something flammable like carb cleaner or brake cleaner and look for an increase in idle, or a stall if the spray is not flammable. An injected car will likely try to compensate for that, but you should notice a change as it adapts. 95% of my experience is with carbs so hopefully someone else will chime in with some more answers.
That idle is pretty high though so the leak is large and should’ve been easy to find if it was on the outside. Did you look at the throttle blade to see if it’s closing?