What I do with my stihl saws is after starting I let it warm up for a few seconds and then run it at full throttle for about thirty seconds. If your saw does not want to keep running I would check to make sure air filter is clean. Next you can adjust carb.setting for idle and hi speed,check your manual for instructions. Also I would remove and clean spark plug,check gap and reset or replace as needed. Make sure your gas oil mix is proper and gas has not been setting for a long time,no more than a couple of months without some type of fuel stabilizer. I use either STA-BIL or sea foam at a rate of 2 to4 ounces per gallon of gas. About the only other thing I might suggest is to check the feul filter. They usually are located on fuel pick up line inside gas tank and can be a pain to get to. Good luck and I hope this helps Thanks
Engine stalls or RPM
fluctuates at idle up and down or dies near idle.
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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