We have 2002 Mercury 200 xl saltwater outboard. If we put it in neutral motor is dying doesn't hold idle speed. At higher speeds is running just fine. It's hard to start it up and is also detonating sometimes while trying to start it up. We changed all spar plugs(found a lot of oil on each one) and fuel filters.Also found an oil on the bottom of the motor housing. Didn't put in the water since than. Is there anything we can try to do before taking it to the shop?
Thanks
Thanks