Chainsaw Repair

So I seem to have the same symptoms.  I can't get the saw to idle properly.  I did not replace the gasket on the back side of the carb where it attaches to the support.  It looked fine and was not torn.  The inside of the carb looked very clean with no build up and all screens were immaculate.

The saw has a high idle with the idle screw all the way out.  When I set the high speed needle to what I think is the correct mixture and then tune the low speed needle, the saw races to what seems to be half throttle.  When I set the low rich,  the rpm's decrease and it will eventually stall.

I think I have to check to make sure there is no air leak but I am fairy certain that there isn't.