Your carb high and low settings may need tweaking if it's not a fuel or muffler issue. I believe needles are made only to be adjusted by a technician. If you want to try adjusting it yourself, google and you tube your to see how.
I had the same problem for a year. I was using a MUCH larger diameter line than my 26vt called for. The first time I started it with the .080 line on it it ran just like it is supposed too!!!
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