Well if you replaced the coil, then I would look at the pickup coil in the distributor. You could check the air gap, it should be at .008, BE SURE TO CHECK WITH A BRASS FEELER GAUGE.
Next check the OHM's by putting your leads in the wire coming from the distributor, it should be in the neighborhood of 300 to 600 OHMs. Next check the voltage output, set your meter to the lowest AC voltage setting put the leads in the same spot and spin the distributor, it should show at least 1 volt AC.
It sure sounds like pickup coil from your description.
One more thing, if you have another distributor you could swap it out and see if the problem goes away. I usually keep two or three around just for that reason.
