SOURCE: 1998 dodge Neon no fire to coil
it sound like you have a bad crank sensor when the sensor gets hot it open circuits inside the sensor and you loose spark if you have access to a noid light see if you are loosing injector pulse also if so then you know its a good chance its the crank sensor
Since the 5.9 engine uses one coil and a distributor, I will assume you have the 4.7 engine with coil on plug ignition.
The easiest way to test the coil is to move it to a different cylinder and see if the miss moves with it.
Problem could be an injector or something mechanical too.
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