Chainsaw Repair

case seals, skuff up the cylinder and put in a new ring, replace pulse line,  replace intake boot, fresh gas too! You will probably run over the issue in that process and have a great running saw when done! Actually I've seen similar symptoms and it was the carb, and best way to solve it is eBay a new one. But pulse line and case seals along with a fresh ring are probably worth the effort. Don't forget checking the plug wire for places it might be "arcing" through to the cylinder or case.