I have a new Shindaiwa bp blower. Because of a new emissions thing they got going on, when you hit the kill switch, it is supposed to idle down slowly untill it turns off. Sometimes it will stay on untill I reach my next yard. Sometimes it shuts off in 30-45 seconds. Lately I have been putting it on choke untill it shuts off. Not sure if this is bad for it or not. If it is, What is an easier way to adjust this garbage new feature?