I just got new plugs when they serviced my engine so today I took out my boat for a test run. The good news is she fires right up, but I think she sounds different. I used to think I could hear her hit all three cylinder. She idled at 800 rpm and didn't hit above 5000 rpms at WOT. Is it possible she is not hitting on all three cylinders or would there be more noticeable performance issues if she were only running on two. Thanks.