97 200 miles 4.0 grand cherokee dies backfires starts and sometimes it doesn't start right back up. strong fue; smell too. have replsced o2 cam sensor ignition switch fuel pump acoil thing. This seems to be getting worse and worse as each time i drive oh I also replaced plugs and wires.. PLease Help Thanks any advice is needed

Sounds like your engine jumped time. I would match the Top dead center line on the crank with the TDC line on the block . Remove the number 1 spark plug. being VERY careful use a screw driver to enter the spark plug hole. It should stop right away . if the screw driver goes almost all the way in? Do 1 more revelution on the crank to the Top dead center mark. Now that you have achieved this. Take the distributor cap off. The rotor should be on Number one plug wire on the cap. If it isn't far off? loosen the distributor screw and turn the mechanism until the rotor is at number one plug wire. replace the cap and plug and try starting it. If the problem is still present? Your motor needs a timing chain.