Fail To Accelerate problems of the 2002 Audi S6

The contact owns a 2002 Audi S6. The contact stated that when the brake pedal was released and the accelerator pedal was depressed in cold temperatures, the vehicle failed to accelerate. The vehicle was taken to a dealer, where unknown repairs were performed. However, the failure recurred. The vehicle was taken back to the dealer. The technician informed that the vehicle was operating as designed. The manufacturer was notified of the failure. The failure mileage was 12,000.