[preservedkillick]

Just a follow up.

Went to the boat, ran the engine and could feel pressure & exhaust coming from the intake manifold gasket. Replaced the gasket, didn't change a thing. Checked exhaust mixer elbow, clean. Running the negine again, feeling more carefully, found an injector near intake manifold was leaking. Took the injector out, found carbon gunk at the bottom where it seats on a copper ring. I cleaned up the carbon as best I could and put it all back together..runs fine. I had no idea an injector could leak like that.