[Ewilliams]

I just picked up a 149 which was sitting in a barn for years. I got it running pretty easy (fresh gas, fuel filter, etc.) and it runs good. I have a problem which I've never come across. As I start to go forward the tractor will just start going faster on its own until it reaches full speed. When I put the brake on it goes back to neutral. I would appreciate any advice or suggestions if anyone has experienced this problem.
Thanks,
Earl