I have a Stihl MS170 that will crank easily but bogs when I try to rev it up. I can gently rev it and get it spun up but a rapid stab on the trigger makes it shut off. It also has poor torque when I try to cut with it. I've replaced the fuel with fresh fuel. I've replace the carb and carb gasket. Fuel lines and filters seem good and not clogged. Any chainsaw whisperers here that can offer advice?
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