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Thats interesting.
So you've already looked at the throttle body and it snaps shut after you release the throttle, but it continues to stay revved up. I'm not entirely sure how thats possible. The ECU is going to inject roughly a gram of fuel for 15 grams of air. . .and if the throttle is closed it just means you get the same power as you would at idle(it wouldn't rev high) but you inject a ton of fuel most of which gets burned in the cat. If the air isn't getting in somewhere somehow it won't stay revved up like that, you can't burn more fuel than air allows.
Next suggestion I think Christ already said, watch the throttle body after someone shuts it down and watch to see if it moves after they let up and after it "snaps" shut. If it twitches to a less open position the ECU is telling it to hold open for some reason or another.
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