i had the same thing happen to mine turned it off sit for 10 min tried to start again and it wouldnt fire, pulled the air filter and sprayed starter fluid in there if fired up but reved to the sky so i shut it off, i replaced the plug and gas, i can get it to fire after about 10 second of turning over but still revs really high like full throttle open, i dont know where to go from here, any suggestions?