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Hello. My name is Tan.
You have one of 2 things going on here. 1) fuel starvation 2) loss of spark. The first one is easy run the boat till it acts up squeeze the primer bulb does it run better? The other one requires the use of a timing light to check spark when engine is acting up. Connect the timing light to the top cylinder run the boat till it acts up. Watch the flash of the timing light. The flash should be steady with no dead spots. If that cylinder is firing good move to the next cylinder. Do this test on all 3 cylinders. If you find a misfire swap that coil with a good firing cylinder. If the misfire moves then the coil is bad replace the coil. If the misfire stays you have another ignition component failing. Either the power pack or the timer base.
Do these tests and post back with findings.
Ok we need to do the spark test with the timing light. If you have a misfire the engine will bog.