I'm not sure about that ECU, but some will rev up the engine if it
appears that a cylinder has stopped firing while idling. Check the
spark plugs after idling the car to see if one looks extra grimy.

It could also be a broken wire on that valve. Audis aren't known for
excellent wiring. I just fixed two wires on my 07 A3 that had been
crimped into connectors so tightly that they broke off. I see lots of
wires into engine block components that are missing a strain relief.
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