Thats BS. I had the same issue about half a year ago. The EPC is basically the system that controls fuel going to your engine. The circuit board that controls the EPC was bad and malfunctioned as I was getting off the highway. Same thing as you... I could rev the RPM's high, but it wouldnt accelerate for anything. Basically, the fuel wasnt flowing and the car couldnt determine what gear it was in. Audi replaced the board, but it did take like 3 days for them to get one in.