Engine starts,runs OK up to 3000rpm and sticks there. Changed plugs and cleaned gas filter. Found about 1/2 teaspoon of water in bottom of filter.Before I go to shop(big hassle getting there)would like to try gas additive injector cleaner.But, I am not well informed on side effects of this stuff. Additionally boat has a 60 gallon tank,would take some time to run enough through to see some results. Would it be productive to add a few teaspoons of injector cleaner to the filter bowl to get a quick shot to the injectors? Or is this like 2 aspirin is good take the whole bottle?