My little wonder blower, honda gx270 motor wont start, cleaned the carb, changed spark plug and oil, nothing, the past few days it has been real hard to start, when it did start their was a loud squeak coming from muffler, also the other day I ran it for a few hours, shut it down, when to start it and it had gas fumes coming from the muffler, now it wont start at all, on some pulls it sounds as if she wants to go, but then dies right down. Any ideas please