I have a 2001 dodge neon & when I press on the gas to go it starts to jerk & it takes a while to accelerate... But this happens when I press on the gas hard to go speed up quicker, it seems to do okay & doesn't jerk when I step on the gas lightly though or at least as much. It also does the same shaking/jerking when I'm at say a stop light & my foot is on the brake... When I'm in reverse... I mean pretty much anytime the car in on... Even in park. I don't know much about cars & I'm just trying to find out the problem. I have also done a fuel treatment, thinking it just wasnt getting enough fuel when I pressed on the gas hard... Because there was too much gunk... But the treatment didn't help any. Any answers would be greatllllly appreciated. Thanks! =)