I have an A4. I was in a parking lot the other day. I drove into a parking spot at normal parking lot speed, stopped, put it in reverse, backed up a little, stopped, and put it in drive. The car then just stalled . I restarted it and everything was fine.

Earlier that day, I had the oil/filter change, tranny fluid/filter change, spark plugs changed [except for #8, couldn't get to it]. Could a loose plugwire have cause the stalling?