I have a 90, Same powerplant, 229k and still starts and runs very well... Pull the distributor cap, lift off the rotor and look at the pick up plate, if there is ANY play, replace It, I had to put a reman distributor in mine. Those particular years for (all) MoPar pick-ups were quite problematic,....I guessing the inline fuel filter was replaced, Check the fuel pressure,I don't have the specs yet,...Is the in tank fuel pump noisy or can you here it at all, mine quit at 90k, It just stopped,....soon as I finish my coffee and wake up I'll get my book...
