I have a Tecumseh 10 hp engine #143.406022 on a Craftsman lawn tractor. It has been sitting for about 10 years in the back of my garage and my son-in-law needed a mower so I pulled it out. I put a carb kit in it but when I start it I do not have control of the throttle. It has 2 speeds fat and faster. It run good but the engine was only about 2 year old when I stop using it. Can anyone give me any ideas about what be my problem? THANKS