Personally, I would pull the carbs and clean them yourself. I seldom trust other folks when it comes to my toys unless I truly know their work skills. Like the previous people mentioned, it's carb related and sounds like the jets are still clogged. Some people think spraying carb cleaner on the carbs is cleaning it which isn't. You'll have to remove the jets, and clean the tiny orifices with some copper wire to scrape off all the crud.
There are many tutorials here that will go over the cleaning process and carb removal.
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