Need help with mercruiser 170 4 cyl

by Derek the katman katter
(Sellersburg indiana)

I'm getting spark at all cylinders but boat won't start boat was running and seemed to be getting harder to start each trip I'm new to boats so I was clueless I've done lots of research and can't seem to figure it out. When cranking I even get it to cough a few times but won't take off even seemed to gallop like a horse one of the times but wouldn't start

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