I'm a bit confused about idle RPM being controlled with the timing ... shouldn't timing be set properly then idle adjusted at the carb?[/QUOTE]
I have a programmable crank sensor ignition. You can effectively make the idle more stable by advancing the timing as rpm drop lower which counters the load of ac or being put in gear. It will settle into a happy spot. When you unload engine in park or ac kicks off rpm won't run away because timing is taken away as rpm increase. This is all within a 200 rpm window. This it the opposite of what manifold vacuum and vacuum advance can deliver.
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