Here we go again...

I'm not familiar with your car, but you mentioned "reluctor" so I'm assuming you have an electronic ignition. I had a similar problem with my old 72 Fury. I ran a few test with an old style engine analyzer, and after running the test three times I got the same results. It was the magnetic Pick up coil in the distributor. I replaced it (at the time they were about $15.00), and the problem disappeared. Had the car for 5 years after that, no problem.

Just a suggestion. Hope it helps.