I have a Huskey 345 great little saw when it runs ! Problem is keeping it running. It starts fast and easy but usually 1/2 way through a tank of gas it looses power and begins to bog out , choke, and stall. Then it is harder to start. Once started it will run for a few minutes and begin to bog out again. Seems to happen when it gets hot. Brought it to 2 Huskey shops and they say there is nothing wrong with it. Something must be if you can not run the saw for more than 15-20 minutes without trouble!! Any suggestions? One shop says they did a carb adjustment but it still doing it