A friend of mine just bought a 1936 model M crawler that wasn"t running. He replaced plugs, points and condensor, rebuilt the carburater, replaced radiator core, adjusted valves, rebuilt water pump, cleaned out fuel tank and istalled new sediment bowl and filter. The engine starts and runs on all 4 cyliners but will only idle. The throttle shaft on the carb turns when hand lever is moved but rpms don"t change. Also water in radiator boiling after running about 5 minutes but temp gauge only shows 180 degrees. (new gauge) Any ideas on the throttle and cooling system problems. Thank you for your help.