Well, unloaded the boat from the trailer and started it up this morning and only ran for about 30 seconds then it shut off.
Started about 15 more times with the same problem.
Called my boat mechanic and he thinks that the jets in the carb are gummed up or oil pressure switch may be bad. Has anyone else had similar issues. I have a 00' Mercruiser 4.3l but is a brand new long block (44hrs). Only thing that isn't new is the carb.