Dead cylinder/ wet plug

Hvacguy85

Recruit
Joined
Jul 17, 2019
Messages
5
Plug is wet and seems to be loosing spark or weak spark from being wet. Checked spark with spark tester and getting to plug. All cylinders are getting 160#. Has new wires and dist cap. Motor does seem low power in the water planning out but then gets up to speed and runs smooth. Has slight skip during idle. Oil pressure good. Does have a little oil blow back from the oil filler cap (oil on the valve cover coming from filler cap). Don't know if any is related but what to check next?
timing?
Oil level? It slightly above line but I don't know what the tolerance is.
 

Hvacguy85

Recruit
Joined
Jul 17, 2019
Messages
5
3.0 mercruiser. 2001
Only number I find on motor is 14097080 on the exhaust side of the block. The serial number is missing on the name plate on the spark arrestor.
 
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