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Popping from the engine is a sign of abnormal fuel burn. A couple of things can cause that including but not limited to a sensor issue, low fuel pressure, dirty fuel injectors, sticking fuel injectors, old gas, and water in the gas.
How old is the gas in the boat that you are trying to burn now?
Can you do a compresion and spark test on the engine? If there is something else going on like a bad head gasket that can do it as well.
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With the power loss, you are not running on all 4 cylinders. This could be cause by one of the already mentioned items or the filter in the fuel line is clogged, or the last one would be debris in the carb bowl that is blocking the jets, and then moving sometimes and allowing you to make full HP. The excessive fuel burn could also be caused by this. first check that I would do in the shop is to inspect the spark plugs and possibly replace them then run the engine to see if that made a difference.
Check the fuel filter and then drain the carb bowls. try and catch the fuel from the bowls to see if there is any debris in it.