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I don't know either but if you figure it out post it up ....Mine is doing something at times mine almost sound like yours ...........
I'm going to add to this post ..I've had 2 in the past that had broke valve spring.. They would run good at iadle a few RPMS up but then at about 2000 start missing or running bad ..You may want to pull your valve covers off for a very close look....these are very easy to miss so look good ......
... I may open a hole new can of worms when I say this but to me the only float setting that matters is the top setting ...It needs to shut off the fuel but the bottom setting to me if the float hits the bottom of the fuel bowl then it'll only lets fuel in until it fills up ....