I have a 2007 Mercury Bigfoot 50. Ran engine for about 2 hours and on way back to the dock. At WOT started surging a bit. Ran fine everywhere other than WOT. I got home and tried to flush the engine but could not get it to start. It turns over fine but does not start. Now I notice a small amount of oil seeping out of the water inlet holes on the lower unit. Any idea what my problem could be?