Hi, I have a 95 Jeep Wrangler, 4 cyl. My problem is that I can start the vehicle fine. As soon as I drive i get a check engine light that pops up. When that occurs, I soon find that it disappears while the car jerks. Then it will reappear a few seconds later and do the same process. The only thing that is added to this problem is that I smell faint gas fumes and my rpms raise high and low while I am slowing down. Any suggestions at all would be greatly appreciated.