My 1994 Chevy C3500 crew cab 1 ton with a 454 is having a serious issue of dying when it warms up in the morning, once I get it to operating temp and get out on the road it just dies. I took it to the Chevy dealer and they replaced my radiator and fixed a short problem I was having in the wiring (not sure where). But same ol' thing, I get it warmed up head out and at some point it dies within a few miles down the road. What I'm wondering is if I need new spark plug wires, plugs, distributor cap and so forth. Chevy did a pressure test of the cooling system and found a big radiator leak but it still has a dying issue. I also replaced the thermostat. Any help or suggestions would be appreciated.