Looking for any help. My Poulan 4218 just isn't running well. It sometimes idles high and the chain wont stop. Sometimes idle is good but when I try to give it gas, it stalls. Sometimes will idle ok for a minute then stall.It will sometimes just bog down while cutting too. VERY frustrating when trying to work! I do know the gas mixture is good but have heard that if the gas is more tham 30 days old that could cause problems. I don't want to put tons of money into repairs, would rather put that money towards a new one. But would definately be one of the big name companies this time. Any help or advice is appreciated!