Engine was running fine , have 20 flights on it. Hit throttle kill and it would shut off. Engine is tuned correctly. Why would it just all of the sudden start to not shut off and then stay at high idle. I dont really think throttle kill is the answer as it idles way to high when completely closed,and im not going to dead stick it every time or have to hold the plane after i start it just so it doesnt taxi on me. There has to be some other problem. Like i said it runs fine and it wasnt doing this the first 20 flights.