I was driving on my local road on the way home going about 40mph, had to brake because a car in front of me braked to turn and after i went to accelerate back to 40 but my car engine reved to about 4000 and i wasnt going anywhere. So i was just thinking what the hell is going on? i let off the pedal and made my way to the side and let the cars pass. It felt like if my car sliped into neutral or it missed it gear shifting or something but i tired to go again but it just revend my engine and didnt go anywhere. So i tried switching it to park and back to neutral and it worked again but as i drove it felt like it went back to neutral engine reved again so i was like hmm let me try to down upshift see if its the gears but nothing happened so i pulled to the side again and this time i just completely turned the car off and back on and everything was okay again. Anyone tell me what happened? little scared to drive my car again, if i was on the free way it would of been bad. So basically my shift knob was on drive the whole time then suddenly it just felt like it was on neutral. Car only has 21,000 miles and my gas was low like the second line im not sure if that will effect anything. Assuming its a tranny problem?