97 grand cherokee 4.0 4x4 acts like no fuel dies while driving. have replaced fuel pump to crank sensor o2 sensor ignition switch and plugs and wires. . Some times there is a strong unused fuel smell sometrimes it backfires and sometimes it doesnt start back up for a moment. Any idea what is causing this problem? Anyy advice woujld be great Please

did you change the fuel filter, very common problem that gets over looked too many times

I had a similar problem with a 1992 BMW 3 Series, it would idle funny, backfire, and then die. The problem turned out to be with the mass air flow sensor, it just need to be cleaned (I used break clean). Eventually I replaced the sensor, but cleaning one or twice a month seemed to do the trick.

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.

change out the throttle position sensor

i think the catalytic converter is clogged up, meineke , midas or somewhere of that sort will test it for free where i live, call ahead and check where you live , it only takes them a short time to do this test, and it sounds like you've spent plenty, its a free test, and can very well cause the problem you say you have GOOD LUCK!!!!!

Check your fuel pressure and compression. Could just be a bad fuel pump thats not putting out enough pressure to your engine

have you looked at the plugs

the crankshaft position sensor controls spark and if faulty would give the symptons you have described you need to get this checked first

have u replaced the crankshaft position sensor? do u have any computer trouble codes? Kragen or Autozone will run the test for free.

But, you did not change the crank sensor (on the drivers side of the bellhousing, just where it's a real pain to get to)