Al Smith
Mac Daddy
Well they can be frustrating at times .Sometimes you just have to set them on the self until you regain your cool . With me sometimes that might take a couple of years .
A carb kit is a cheap way to do some more analysis as well. I have torn down a couple of carbs with some problem saws and found little issues inside. Rebuild and they run fine. Then again, I can think of two that just need new carbs. But that is more of a wear issue with idle screws. They just won't stay put!