I have an 07 Speedster that I had winterized at the end of the 07 season, and due to out of state work couldn't put it in the water in 08. We took it out over the weekend to see if would crank and the check exhaust started flashing. The boat cranked right up and idled great, but it tried to go dead as we started running. I remembered the man who winterized it telling me he put some sort of plug under the seat, but I can't find it. Is there a plug that could cause this problem, or do I have an even bigger problem?