My recently restored '81 CJ7 coughs and dies after about an hour of operation. I let it cool off for about 30 minutes and it fires up like nothing happened. It has the 258 inline 6. I retrofitted it with the Mopar MPI fuel injection system with the computer and electronic ignition and all the rest of the fancy, difficult to diagnose stuff. All the parts are new. I haven't tested the fuel pressure with a gauge but it appears to be getting plenty of gas. Has anybody with this system experienced a similar problem?