Audi Q7 2007 Questions

Audi Q7- Driving on highway at 70mph, going down hill and ...

Audi Q7- Driving on highway at 70mph, going down hill and not using the gas pedal, as I was going up the hill, I put my foot on the gas and the car stalled. This happened twice on an 10 hour road trip. Can you explain the problem please.

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I just bought a audi q7 2009 from states, does scanners from europe scan it when it goes for a service as I live in europe