Driving along at 60 mph suddenly my car stops going in heavy traffic and won't move,, then it accelerated to high RPMS and was stuck, then it hard shifted into gear and it lundged forward fast and went about 5 feet then it wouldn't move. Almost got killed on a busy hwy. because of it accelerating on its on out into traffic while it was in park, then just came to a dead stop. The only way I can describe is it was not moving in park, then it was like it shifted by itself and lundged forward and stoped like it was slammed into park from a high speed but it did it this on it's own while the shifter was in park. It took off again and I drove it to the side of the hwy, and turned it off. Called and got a friend who has a trailer to come tow me. I Cranked my car to see if it would move to get it on the trailer. I Slowly drove it up on the ramps and got about half way up, then it stopped wouldn't move again, still in drive it rolled back down the ramps on its own, I was just sitting there and it was idling was like the rpms were higher than normal so I shut it off for a minute. Got back in it cranked it up put it in drive and it wouldn't move, put in in reverse it backed up but it was revved up and shifted hard, so I put it back in park and it spit and spuddered so I shifted to neutral an then car just shifted into drive and took off on it's on and drove up missing the ramps and ran into the back of his trailer, crushing my front end. Then it wouldn't move again. Win