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2013 90 hp mercury 4 stroke

wmenzie2001

New member
Hey guys!
I have the above posted engine. I have had zero issues with it, original owner serviced every year. This year I have driven it several times on my small lake and even once or twice on Lake Ontario and trolling for hours with zero issues. I take it out on Lake Erie every year with zero issues. So this year I take it out everything starts fine. Drive 6 miles out at top speed and trolled for 3 hours then it idled really rough and shut down. Tried to start it several times and nothing had to be towed back. Thought it was fouled plugs so I changed them. Took the boat out for a test drive and everything seemed fine. Drove out again on Lake Erie 6 miles and just started to troll and it did the exact same thing. Any ideas of what it could be?
 
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