Hello there I am new to iboats and I am seeking some answers lol well I have a 25 hp evinrude when I first got it the motor did not run I re did the water pump impeller. Changed the lower unit oil and had a buddy redo the carb when I got the motor back from him it ran like a champ. After letting the motor sit for a few months I mixed the gas and oil and went to give it a try. The motor started on the third try but it runs funny now.. It sounds fine but every other 30 seconds it throws like some type of combustion or it sounds like it sneezes and it throws water out the exhaust in a burst and ideas on what it could be? Thanks in advance