I have a Nissan 9.8B 2 stroke that now has water shooting out of the idle exhaust port in the back, instead of exhaust and a little bit of water. A full stream of water is also coming out of the cooling water check port on the side. Problem is that now the motor does not idle well. I am thinking the water pump is OK but am concerned about perhaps the thermostat is stuck open of I have some other water leak. Does anyone know what would cause water to start blasting out of the idle exhaust port instead of exhaust?