I replaced the distributor and put a petronix ignition in the car a couple of weeks ago and when I timed the car the vacum advance worked. Now the vacum advance does not work.
What might the problem be?
Some possibilities:
Vacuum Line disconnected or pinched. Arm disconnected inside distributor, or jammed. Advance plate stuck due to module installed incorrectly. Vacuum diaphram leaking. Throttle plate set above port vacuum.