I had a problem like that a few days ago. Had to rock the car to get out of the snow. When I finally got it out car trans wouldn't engage after first gear. Car was just revving, no power to the wheels. Shut it off and started it again and it's been fine since. I'm thinking it was a relay that overheated since I really had to spin the wheels to get out. Possible trans shop screwed up some of the electronics when they did the fluid change on Slim's car.