I have a Craftsman LTX1000 lawn tractor. I think it is about 7-8 years old. I bought it used this year and am having a throttling issue. (engine: Briggs & Stratton Small Engine Model 407777/0121-E3 20HP OHV I/C Intek Platinum).
When throttling engine to full it only runs about 1/3 power. When I...