This happened to me yesterday. A few times actually. Its like the car has no power. I nail it, and it doesnt go past 3,000. I drop it into S, nail it, and still nothing. Its like the car doesnt want to move. I mean, its moving, but hardly. I went to go get some gas, so I turned the car off for 10 mins while I was filling up. When I started it back up, the car just took off. And this happened other times too when I had gas. Can that diesel purge stuff help? I dont really know what it does. Any advice would be apperiated.