[fourfords]

I had the identical problem in my 6V positive ground '37. The wiring to the resistor under the dash against the firewall was wired incorrectly which sent too much electricity to the coil and points slowly burning them, which created the"Bucking" and general rough and inconsistent driving until failure. Locate the correct wiring diagram, verify correct wiring, test the resister block making sure it is resisting to the correct voltage (1.5V If I recall), and find a local V8 guy who's willing to help. (This will be more fun, and keep the profanity within reason and will help the learning curve) Then have the points and distributor tested.