Was about 8 miles up river from Fishers Landing last friday everything running great and all the sudden I could feel a vibration/cavitation feeling...reminded me of what it feels liek when you suck up weeds in the pump. Boat felt like it lost about 20% power also. So we beach it on a sandbar and I pull the inspection cover and no weeds... none in the grate. So nothing else to do but pull it out of the water. So we go to leave to head back down river and now the boat wont start. Great. So im cranking it over again and again, pumpin the foot pedal and finally we get her going but it's missing, cutting out like there is a fuel blockage or air in the lines...Finally after feathering the throttle for about a half mile it clears out and runs decent all the way back to the ramp but still got this bad vibration while on the gas. Pull her out of the water, take out the bench seat to check the motor out and boom...no crank pulley. Pulley is laying under the oil pan and the harmonic balancer still has the three allen bolts with piece of crank pulley stuck to them. So I unscrewed the allens (which werent very tight at all) and removed the excess metal, and bolted them back in. tightened all the fuel line hose clamps, cleaned the water/fuel seperator with rubbing alcohal and she fired right up and idled smooth. Put her back in the water, hit the gas and...vibration still there. What the hell...so now you can kinda hear what sounds like a bad bearing sound when you get on the gas....but it goes away at idle. I checked the impeller, it doesn't have any big gouges, just the standard pitting on the faces of the blades and rough edges, (aluminum impeller) So im thinking it's the main greasable pump bearing that the shaft runs through. Thats my best guess right now, any ideas here? Motor is a bone stock Marine Power 454, TBI, Berkley pump. Whats weird is how all these issues started to happen at the same time...could the crank pulley shearing off cause something else to go bad?