Very similar thing starting happening to my Ram, and like you I first suspected the ignition system and replaced the coil.

But it kept happening and “the root cause” was that the “sock filter” at the bottom of the submerged in tank fuel pump assembly was so plugged with crud that it created a near vacuum at the suction entrance to the fuel pump. This creates “cavitation bubbles” at the pump suction and stops fuel flow.

When the gasoline cools down a few degrees it will run for awhile again, then die suddenly.

The “crud” restricting the sock filter could come from unclean fuel,
but others suspect it may be from an unusually hardy Algae that can survive in 90% gasoline living on the alcohol and water in today’s E10 or E15 mixture fuel.

Tilting the bed to get at the fuel pump after removing half the Cargo Box frame bolts and loosening the other half was surprisingly easy compared to dropping the tank - but if you drop the tank spend the time and money now to replace the hidden by tank brake line section that is prone to rust and suddenly blow out.

“Cargo Box” is Dodge’s official name for what we customers call a “Truck Bed.”