Sounds like it could be an air/fuel ratio issue, and therefore a carburetor issue. It could be that air is being introduced through a bad seal, o-ring or gasket... Or you are flooding or starving gas due to needles being shot, o-rings messed up or gumming up elsewhere. Since you already took apart the float sand noted gunk, I assume it's not that new, but you are comfortable doing things like that.
Carburators are finicky and if you prefer to take care of it yourself, I would just suggest getting a carburetor rebuild kit from the manufacturer. Otherwise, most small engine repair places do pick-up and drop-off service.
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