1997 Maxim 19 foot boat with 3.0L mercruiser engine

Was running my boat it became very hard to start after I cut it off it turned over very slowly then after it cooled off I got it to crank and all of a sudden it made some really loud blowing sounds from the engineif lost half of its power and eventually cut off and hasnt cranked since. it sounds like it has very little compression and a blowing sound when the motor turns overwhat can you tell me to help me

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