On Tuesday, August 29, 2017 at 12:53:00 PM UTC-4, wrote:
On Tue, 29 Aug 2017 01:35:26 -0700 (PDT),
wrote:

I have a 2011 mercury optimax 200hp. I was out fishing and on the way back in I lost around half the power and acceleration. So when I got home I changed the fuel filter and tried that but no improvement. So then I changed the spark plugs and put an injector cleaner in aswell and tried that but still no difference. What could be the problem. Thanks.

Optimax motors have a computer. Scan it for codes.

Do they use OBDC or do they have a proprietary system?