Wants to die after letting off gas peddle

if you have replaced cap and rotor plus coil and it seemed to fire up then i would take the next step. For sure put your new plugs and wires on then make sure you have replaced your air filter, and change out your fuel filter, fire up the vehicle if it doesn't start I would suggest changing the fuel pump. If it starts up make sure you put in some BK fuel injector cleaner in your fuel it might be you have dirty injectors. If all fails then get back with me and we will look else where. Good luck hope this info helps you out

Fuel injector gone or going, is engine misfiring?

Have you changed the timing belt? or timing belt guides? How many miles? This does not necessarily have to do with fuel.... Could have to do with air intake or timing as well....

Check your fuel pump. Take the gas cap off, have someone turn the key to "run", and listen. You should hear the fuel pump humming for a few seconds, and then stop. If you don't hear a humming, you will likely need to change the fuel pump.
New ones are a ridiculous price for that truck. Try an auto wrecker. Let me know how you make out.

CHECK TO SEE IF FUEL PUMP IS CYCLING WHEN YOU TURN KEY ON, SHOULD HEAR BUZZING NOISE FOR 5 TO 10 SECONDS,IF NOT FUEL PUMP IS FAILING.

Maybe timing belt broke?

what about your antitheft system i have seen lots of ign key cylinders go bad and cannot read the keys resistance

It could be either a bad fuel system or a bad spark system....
Fuel pump, fuel filter, fuel injectors, fuel regulator, spark plugs, ignition coil, distributor cap, etc....

Check the fuel pump.

yes it is possible but check fuel .press. and possibly fuel filter if it hasnt been changed. but most likly going to be fuel pump problem.