I am in the process of replacing my distributor on my 95 3.9 with 140,000. Symptoms were while driving down highway it started to hesitation, back firing, very rough idle. I had it towed home. I tried a few days later to start and it started and ran smooth for about a one minute then start with rough idle. I had recently (less than 200 miles) replaced all leads, spark plugs cap and rotor and ran fine. after the breakdown, I replaced the remote located ignition control module. the vehicle ran fine for one day about 100 miles, next day went to back out of the driveway and have same problems as I mentioned before.
So I bought a used distributor on line quoted "from working Vehicle" but I am having reservations about installing since when I rotate the shaft the it spins freely then feels like its catching on something but then will spin smooth again. is this normal or should it be a consistent smooth operation? The one from my vehicle spins freely with no hesitation or "catching while rotating shaft.
What I have done:
new black Lucas cap
put used Lucas rotor with non pop riveted arm in, removed after market rotor arm
checked and replaced any cracked vacuum lines