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Hi, it sounds like the electronic throttle actuator has lost it's setting. Try turning the key on but don't start the car. Leave the key on for 3-4 minutes then start the car and see if it will idle.
Let me know if it works.
Ok, if the throttle will not reset by leaving the key on you will need to get the car connected to the VW tester to have the throttle adaption done with the tester. This is a common failure when the battery is disconnected.