A few days ago I was driving and my car seemed to rev itself, and I couldn't accelerate for a few seconds. It went away for days, so I thought it was just a one time thing. I started up the car today and it reved itself, from 500rpm to 1500rpm and nothing happened when I tried to rev it myself. I tried to back down the driveway and it jerked, faster then slower, so I hit the brake and put it in drive to get back up the driveway because something's wrong, and I have no power, I couldn't get it to move. It's sitting on the end of the driveway now, luckily I wasn't on the road. 2001 v6 by the way. I can't drive it now, anyone know what's wrong or how to fix it? Thanks.