Two ignition things possibly connected. If the advance mechanism in the distributor is rusty, or broken, it will run as noted. It is simple inside, To test quickly, but not for sure, rotate the rotor CW with your fingers, it should move with modest force. It should rotate 15 degrees or so then spring back. If it does not, or will rotate 15 degrees either way and stays there it needs attention under the breaker plate. Second thing: if there is noticeable play in the rotor shaft (sideways in any direction, not in the direction the rotor is pushed on) it needs to be rebuilt. Play here results in wild timing changes, and missing. If there is a intake manifold leak, or a really bad intake valve guide, the engine will also miss under idle conditions. Use propane from a small torch with the tip removed to find a leak like that (do it outside, use a small opening on the propane knob, and move the propane around the manifold and manifold gasket at the head to ad fuel to the leak. It will quit missing as soon as the leak gets fuel. If this is unsuccessful, se which cylinder is missing, by pulling one plug wire off at a time (insulated pliers are a must) if you find it, change plug location, and see if the miss follows the plug. If so put in new plugs. If it doesn't, check the valve adjustment. .020" cold all valves. Good luck, JimN
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