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mercruiser 302/5.0l running issue

ok folks. im james its my first time to post here as I just became a member. yesterday I had taken my 1973 caravelle trihull out to the lake. It ran like a champ for about 45 min then I noticed a change on my vac. guage. I was loosing vac. off the intake. and then the engine wouldn't run over 2000 rpm. after getting closer to the dock I had shut the engine off to coast in as there was others putting and taking boats out. after dock cleared I couldn't get engine to fire up even in "neutral" so I had to jump I and swim to bank and pull the boat in. is there anything to have a look at other than fuel filter?
 
I assume this is a point ignition.........I would check or perform a complete tune up on the points rotor and condenser.

Sounds like your points closed.
 
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