A big part of diagnosing your problem is telling the forum what is happening when it dies. Mine was doing the same thing. Many hours cleaning connections, grounds, checking wire integrity, yada-yada. I finally bought a used ECM to see what would happen and Viola! Problem solved! Tell us if the check engine light is on when it dies, do the gauges sweep as they do when you first turn the key, will it crank but not start, that sort of thing. There are some smart cookies here (not me) and they will get you started with some good ideas. Good luck!