It certainly sounds fuel related, remove the fuel hose from the fuel tank and replace the filter on the end, try the machine again, if it is no better it could well be an issue with the fuel tank breather, to test this run the saw until the problem starts to occur, slacken the fuel cap enough to allow air into the tank, if the machine picks up and runs well you will need to replace the tank breather, let us know if this works and i will will go through how to change the breather.
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