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Engine Cutting out

swc65

Regular Contributor
It’s been a while since I’ve been here, had good luck. 93 OMC 5.7L Sterndrive.

First time out today short backfire after throttle up first time, after cruising fine for an hour engine stumbled and died. Started right up ran another 15 minutes then Began cutting out and does again. I then hammered it WOT for a few minutes and it stumbled again. I think it fuel related but not sure.

How can I tell if it’s fuel or fire? Where to start?

I’ve got a glass filter and see some small debris but it full of fuel. Looking for best place to start.
 
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