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Maintenance work. In other words, the Husqvarna 543xp saw does not rotate properly and shut down at times. When the tank cap was opened, it ran fine again for a while. I cleaned the gas tank and checked the fuel hoses, everything was fine. But the replacement air valve in the fuel tank was blocked. The saw didn't get replacement air and then no gasoline either. Finally, some sawing with that 543xp saw. I think it's going to get better.