I have a 1998 Tiara 3100 with twin Crusader 454 XLi engines, fuel injected MEFI 4. The port engine will start fine when it’s cold. After running under power near idle for some time, it will die. Then it won’t start again until you wait Some time, usually the next day. I was reading that it might be oil pressure switch or maybe ignition switch. Any other ideas? Does anyone know where you can get a service manual or electrical diagram for this engine?