ok so a buddy of mine has 1997 grand cherokee with the 4.0HO and when it warms up it will occasionaly more often than not sputter and die. after waiting 5-10 min. it will start right back up and be good to go. the fuel pump and filter have been changed and the computer too. not sure what else i can tell ya cause he is asleep at the moment and obviously cant answer the radio, but i will be happy to pass along any questions.