cowroy
Addicted to ArboristSite
Like Andyshine77 said, pull the muffler and take a look. If it looks good, check compression. Another fella on here just had the same problems you are describing. He tried everything under the sun including several different carbs, new carb kit, fuel and impulse lines, pressure and vac tested, and was just about to let it go for parts. He had done a compression test but thought it was ok at around 135psi, I think. Put a new set of rings in it and it jumped to 150psi and it ran like a new saw. Good luck and let us know what you find.