I am a start with the basics kind of guy. Pull the plugs and make sure not fouled or cracked. Just for giggles, do a compression test. See if anything is all of the sudden way out of wack. Next, I would bring the motor up to top top dead center or where ever the spec is for no. 1 to fire on your motor. Trace the no. 1wire to the distributor cap tower and put a chalk mark under the no. 1 wire tower. Remove the cap. The rotor should be pointing at the chalk mark or pretty darn close. Check the cap, make sure it’s not all gummed up or filthy or just plain worn out. Check the point gap. How old is the coil? Vacuum advance is next, make up a little adapter and rubber hose arrangement so you can sort out whether the diaphragm is bad. If it is, you have both a bad vacuum advance and a vacuum leak. You might also pull the valve cover and just make sure no bent push rods, broken push rod cups, of flat cam lobes (no lift on one or more valves.
Last edited by Dragsix; 01/06/2018 11:48 PM.
