Not Ranked
I would be inclined to look at the internal linkage (if so equipped) on the carb. Sounds like the the throttle plates are sticking and closing a minor amount after engine idles for a few seconds. It could also be related to the centrifical advance mechanism in the distributor not returning to the base setting.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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