If the engine will run, try bleeding some propane around the manifold from an unlit torch and if your rpms change, you should be able to pin point closer (crack or bad gasket ) once you know the area where you get a rpm change. just a thought.
This is an older thread, you may not receive a response, and could
be reviving an old thread. Please consider creating a new thread.
My Tractor Forum
A family friendly forum community dedicated to all Tractor owners and enthusiasts. Come join the discussion about specifications, modifications, troubleshooting, maintenance, and more!