Driving down to Moab today I ran into a strange problem. My jeep was about out of gas and started to severley hesitate when I accelerated. Filled it up, continued driving with no problems until about 70 miles later when it did the same thing full of fuel. When I try to accelerate it sounds like the engine shuts of then it slows down. It typically happens at higher speeds like 60 accelerating to go faster, and gradually happened at lower speeds. It is the 4.0 liter engine. It drives fine at lower speeds like around town, but I need to figure it out to hit the trails and get home. Has no fuel filter and I checked the vaccuum line, so I am guessing a fuel pump or computer issue. Any ideas out there or suggestions of mechanics down here in town? Thanks ahead for any feedback or assistance.