There are a few things that you should not do when driving an automatic transmission car. First, you should not put the car in neutral while it is moving. This can cause damage to the transmission. Second, you should not shift from drive to reverse while the car is moving. This can also cause damage to the transmission. Finally, you should not hold your foot on the brake pedal while shifting between gears. This can wear down the brakes and make it difficult to stop the car.