2004 Stingray 190ls with a 3.0l MerCruiser. Anytime I get above 4K rpm’s or like 34mph I start to get popping or what seems like backfiring through the carb. Motor has had a full tune up and carb cleaned but the issue is still present. Also had valves adjusted and a fuel/water separator...
Just finally got around to pulling the boat out of winter storage and hooked it up to the hose for a test run before trying to take it out. Within a minute of running it started shooting oily water out of the breather hose on top of the valve cover then began knocking. I shut it down and thought...
