I have a 2010 175 standard optimax SN#1B789623 that was missing the last time I took it out. I changed plugs (IZFR5G @ .031 gap) and fuel filter. Today I ran it, and it only missed when I first took off and this only lasted for a minute. After that, I ran it for 30 minutes with much of the time at WOT. During that period of time, the engine missed for just a second while getting on plane. After that, I couldn't get it to miss.
I'm planning a trip, so I'm hoping that I've fixed the problem, but I'm still concerned because it missed today, even after changing the plugs yesterday. I was wondering if the engine might have a coil going out and it only shows itself when cold. Does anybody have any suggestions about checking something else? I do use 87 non ethanol, DFI oil, quickleen every tank and follow Don's annual maintenance plan. Thanks.