This one is driving me crazy!!! My 220 set all winter with fuel in the tank and carb.I know that was stupid but I did it.Now it will start up and idle just fine, purrs like a kitten,but give it some throttle and she bogs down and dies.I know this sounds like a dirty jet problem but I have given the carbs a good professional cleaning and made certain that the jets and all ports and holes were like new again.Put her back together and guess what? no difference at all.Everyone says it has to be dirty carb but I am 100% certain that the carb is clean and should be working good.My question is,what else if anything does anyone know of that may possibly be the cause of this?I have cleaned the tank,new plug and done all of the obvious stuff but nothing has made any difference at all.I am about ready to shoot my old 220.By the way ,it is a 99 model and until now has always ran and performed great and has been well taken care of.Any help is greatly appreciated.