Check the fuel and impulse line for cracks. The in tank filter may be plugged. There is also a small screen in the carburetor that gets plugged with flock from the tank filter if it has that style.
Is the air filter clean?
I have had similar issues with my Stihl 026 chainsaw. Many times it is the tank vent. It is to the right or left of the carburetor attached to the tank.
May have a prob w/H mixture setting. Many of the carbs used on 026s have fixed H mixture.
I’d also check that the carburetor is properly attached, and gasket not leaking.
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