1988 johnson 140 looper
Losing power at WOT and cylinder 3 spark plug has dry black coating all over. Notice the pics as if you were lookin at motor from back. The 2 on the left are cyl 2 and 4 and the two on the right are 1 and 3. Also cyl 4 spark plug the sleeve slides up and there is no gap. Not sure why it does that. Maybe the plug is bad. I checked compression and it was 1-125 2-125 3-122 4-130. I changed all ignition parts except the timer base. I think it has a misfire on 3 but cant pinpoint the cause. Second picture is cyl 4 and 3rd pic is cyl 3. Any suggestions??