I have a 1996 7.4.
I noticed the motor was missing/popping last year so I changed the plugs and wires, cap and rotor. That didn't seem to solve the problem.
We're out on our first trip and the boat ran great the first day out but started doing the same thing on the second day. We could hear the motor
popping on the left side so I changed the 1,3,5,7 plugs. They were all slightly rich and the 7 was very rich.
With the new plugs, it ran better for a half day and then got worse. Today my top speed went from 45 down to 30-35 with a lot of popping/missing while the motor is under a load.
Thoughts on what could be the cause?