I have a 1969 Buick Skylark, it was parked when I turned the key on the ignition and the car jumped backward fast like I was in reverse. The car can shift gears without the ignition turned or the key in the ignition. My first question is should the car be able to shift gears without the key? Also is there some way to make sure that doesn’t happen again? I had the emergency brake on, which surprised me for the car to jump so quickly. Thanks for any help.