I've been having problems starting it. and when it does start I have to be real careful, any little twist to change hands and it stalls again. Over I again, I turn choke on and pull, turn choke off and pull. Finally I'll get it revving up real high then it's good to work with. I changed the air filter, the spark plug, the gas.. Maybe I'll try 89 octane. I own a Sthil power head with a edger attachment maybe I'll convert that to a trimmer... or maybe by a carb for the echo or maybe fuel filter? I suppose I could just buy a new one but I wouldn't mind fixing this one. I'm having similar problems with the echo back pack.. I wonder if it's that Echo oil mix?