the other day i started my car in the morning to let it warm up. It started a slight bit hard, but nothing major at all. i went intside for like 5 mins, and came out and my car was dead. i was like ooohhhhh ****. i tried to start it, and it died as soon as it started. i tried again, ran for about a second longer, then died. the third time i staed it and gave it a little gas. held it there till i was ready to roll, and then it was fine. The only other thing is, after driving for about 15 mins, i was on the highway goin like 65, and i felt like three jerky motions, about 2 seconds apart. This jerking happened again yesterday like twice. It was a harder jerk tho, it sounded like my car stalled or something. i dunno, im a total noob, but things i have guessed would be a bad fuel system, too low of a idle, coolant? i dunno, any suggestions would be appreciated!