We had a similar problem and it was Ethanol gunking up the engine. Had the carb removed and cleaned and it purrs. (other mechanics said it was fuel line, starter, pump, etc.)
If everything is running fine now and it's just a matter of turning your idle screw, why not just run the engine and make the adjustment?
Also suggest using "Stabalize" or some other fuel additive on regular basis and if possible, disconnect fuel line and run engine dry after each use. (advice given based on experience)
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