Grab the distributor and twist it, is it loose at all?
Is the cap loose?
Is the rotor burnt? Is the cap new? Even new ones can be crap. The distance between the terminals and rotor is off on some.
The reluctor can be rusty?
If so , turn it till it pops out the carb and back it down.
If not, start at the points, then the resistor, then the box, and the distributor.
I went threw 3 new, non rebuilt mopar SB distributors before I threw them all in the trash and went MSD pro billet.
Everyone says the mopar ignition system is great and it is, until it's not and you gotta chase gremlins in old junk and new overseas garbage...
