Ok, I have a 1968 Plymouth Belvedere 5.2L stock. I just finished replacing the timing chain on it. I fired it up, it ran smooth for a day then started idling rough and died. Reset the point gap, same thing. Ran great for 2 days (drove around town and everything.) then idled real rough and died. This has happened about 5 times now. Each time it runs great (occasional misfire but for the most part idles smooth) then just runs rough and dies. Pull off the distributor cap and play with the points and all is good for another day or so. Each time I look at the points they are a little black and rough. I had thought that they were bad at first so I swapped them out, same thing happened. New points were dirty as well, but not as bad as the old ones. I even have a spare distributor so I swapped it out, same thing happened. When I reset the points it has started up, ran smooth for a minute, then idled rough, smoothed out, then rough again. This happened a few times while I was playing with the point gap. I thought I just didn't have the gap quite right so I would go back and adjust it again and this seemed to fix it. Each time it runs smooth for a day or two and dies. Tried new coil and condenser. New points, new distributor and no matter what the same thing happens. It has new plugs, plug wires. I checked the voltage at the coil and got 6.5 ~ 6.9 volts, is that normal? What else could possibly be causing this issue?
