2000 Dodge Ram randomly dies. Hot, cold, rainy or dry does not matter will die.

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Dies going 60, 30, or at a stop sign with no indications like stumbling or running out of gas. Radio and power remain on, just the engine dies. What I have done: Changed distributor, cap, rotor, plugs, wires. Tried 2 different pcm's, changed sensors: tps, iac, map, crank, cam. Has a new battery, alternator, fuel pump, coil. Checked engine grounds, shot wires to all sensors - continuity and to ground. Verified all relays and have swapped them out. At my wits end. Dodge dealer and another mechanic could not find anything and didn't even have a suggestion. I have basically changed everything every forum suggests, this problem is very common if you go through all the forums and they suggest many fixes, none of which has worked. Thought I had it fixed, but it died again on the highway, help! No codes ever show up on this, dealer verifed no codes also.