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one of a few things maybe...
1) idle air screw out too far. should be right around 2 turns out from all the way in.
2) your petcock is sticky and at low rpm it isn't enough vacuum to open the petcock adequately starving the carbs making them lean or maybe you have a slight vacuum leak
3) your idle jet is still partially clogged and you have gotten around the issue by turning the idle up but once its nice and warm your idle goes too high
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