Hello,
I have a 2003/2004 225 Mercury Saltwater. Today while running to the gas dock she started to sound lounder and vibrate more than usual. Thought I might have gunk on a plug/in the cylinder and got her up to cruising speed and it did not burn off (as it did about 3 days ago). Seemed almost like a cylinder was missing. Took out the plugs, they were a little fouled but nothing terrible. The last plug I looked at had some corrosion on the bolt and around it when seated. I cleaned it up and put it back in but it still did the same thing.
Is there a way to clean out the cylinder with the plug removed?
I plan to replace all plugs tomorrow, but does anyone have any idea what this might be? An easy fix possibly/hopefully?

THanks
I have a 2003/2004 225 Mercury Saltwater. Today while running to the gas dock she started to sound lounder and vibrate more than usual. Thought I might have gunk on a plug/in the cylinder and got her up to cruising speed and it did not burn off (as it did about 3 days ago). Seemed almost like a cylinder was missing. Took out the plugs, they were a little fouled but nothing terrible. The last plug I looked at had some corrosion on the bolt and around it when seated. I cleaned it up and put it back in but it still did the same thing.
Is there a way to clean out the cylinder with the plug removed?
I plan to replace all plugs tomorrow, but does anyone have any idea what this might be? An easy fix possibly/hopefully?
THanks