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I think your problem is alternator torque load on the engine. An alternator can put a significant drive load on the engine at high load conditions and actually cause it to slow the engine enough to cause a "rough idle". There was a device used by Ford and others in the pre fuel injection days called a "throttle kicker" that mounted to the carb and would speed up the idle when the a/c was turned on. It was a small solenoid that functioned as an idle stop that was higher set at a higher rpm when on and went back to normal idle when off. This can be done automatically on fuel injected engines with computer stepper motor idle control but not on a conventional carbed engines. Your ignition might potentially be a problem but even an MSD will function at lower primary voltages.
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