I have a yellow john deere mower that runs great. But that's just it . It won't shut off. I've changed the ignition switch, voltage regulator and two relays. Still have to choke it off. The oil press. light does not come on when starting like it used to. It has a Kaw 14 hp pull start. Can someone give me some advice. I don't like using the choke all the time, fouls the plug....Maybe a broken ground???? But where?? It is a 1996 model. Thanks Guys..