Here is one for you pros. This is a tough one. I have a 1987 Bayliner with a 3.0 ltr 4 cyl OMC Cobra I/O. The problem I am having is that when the motor gets up to operating temperature the boat literally just dies. When and if I can get it started again as soon as I put it in gear it dies again like it is starving for fuel. The boat starts fairly easy and has a slight, almost unnoticable miss or sputter every now and then that I can't seem to clear up with timing/tune up, etc. I replaced the carburator thinking that was it and that didn't work. I replaced the fuel pump and same thing. I went electrical and took out the points and put in a electronic ignition conversion kit and it now starts easier when it is cold but same problem when it gets up to operating temperature. After listening to a few people who put their two cents in they thought maybe a wire was breaking down when it got hot so I replaced the entire engine wire harness and that didn't solve anything. It still literally shuts down after it gets up to operating temperature. When I am cruising, right before it gets ready to die it starts surging/missing. Then it dies. When it cools off it will start right back up and run fine until it hits operating temperature and it goes ka-put again. I changed the coil, wires, switched plugs with the old ones I keep as spares and same problem. I did a compression check with the engine both hot and cold and all cylinders are within their specifications and no two cylinders have a variance of greater then 25%. There is no water in the oil. I did have a crack in the block when I bought it ( the previous owner told me it was the exhaust manifold gasket-he was lying or wrong) that I had a machine shop weld up. A friend made the suggestion at something inside might be still cracked and when it is cold it is closed and when it gets warm it opens up and causes my problem but I can't imagine what it would be. The crack was on the exhaust side of the engine or right side if looking at it from the front. The only thing I haven't replaced is the entire distributor. Could this be a problem? What about valves, head, etc? That I am not schooled on. I am at my wits end and don't have any other ideas and have sunk a ton of money into this thing and it still doesn't run right. My wife is about to kill me for spending what I have and the kids are anxious to get back in the water. Any and all help/suggestions will be greatly appreciated. Thanks in advance. Greg