1996 chevrolet 1500 4wd truck dies while driving has happened 3 times in 6 months

Not alot to go on here especially since the problem is so intermittant. You could have the beginnings of ...fuel pump starting to go, ignition coil or ignition mudule problem, idle air control problem, tbi or injector problem, computer problem, ect,ect,ect. If the problem develops more to where it dosent start then you could check for spark, fuel pressure, injector pulse. If you want to try some inexpensive things then start by replacing the fuel filter and plugs. Take a spray bottle and while the engine is running spray down the cap and wires to see if the spark is shorting out. Otherwise take it in and see if a mechanic can find something. Trouble is if its not happening its hard to find. Good luck!