1991 dakota intermittently stalls or will not start after being run for 30 minutes or more of running.

The computer or proper name the pcm, powertrain control module, 1997-1999 these jtec computers would go bad at around 160,000 miles, ram van ram truck except diesel, durango, dakota all used the jtec pcm, different programming of course for engine size and state emissions 2000 and up totally different using a separate module for the transmission control, cheap on , im using a 98 ram van pcm in my 98 rt dakota ebay both have 5.9 v8 magnum engines

When it does this you need to check if you have voltage ( spark ) going to the end of the spark plug wire, but it sound to me like your pick up coil is going bad, pick up coil sit under the distributor cap under the distributor rotor same size as distributor assembly ( black ) cheap$$, good luck, hope this was very helpful.