Sounds like a fuel issue. Try cleaning the carb. Get a temp tank if you need to and gravity feed the carb with fresh gas to eliminate fuel delivery or bad fuel as a problem. I don't think the carbs have any adjustments for fuel/air mixture.
For what it's worth, I've had three Vanguards in different 1641s and they all surged. I may not be a good mechanic, or the Vanguards are finicky, or a combination of both.
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