When it dies, do the idiot lights light up? Do you still have juice? When it dies can you crank the engine over, or is it really like your battery is dead?

In any case, check your battery and alternator cables carefully. Check the 25 amp blade fuse mounted precariously near where water can get into it on the rail in front of the driver's side front wheel well.

If you still have juice (idiot lights & headlights are OK and engine turns over), then first resolder your fuel pump relay if you haven't done that in a few years.

If the fuel pump relay doesn't do the trick, go to the 700-900 FAQ and do their diagnostic sequence for stalls/no-starts. Normally the first thing to do is to determine if you're getting spark when you try to turn it over, then you go from there once you determine if the problem is fuel or ignition related. It could be many things, so you'll have to do some work to narrow down the possibilities for anybody on this board to really be of specific help beyond just guessing.