Mitsubishi Pajero: Won't restart

LOOK at the fuel system. It's usually the cause of the problem. It could be a number of things, from a faulty fuel pump to a faulty fuel pressure regulator and dirty injectors. The temperature in the engine bay builds up after you turn the engine off and can cause the fuel in the fuel lines to vaporise. When you come to restart the engine, there isn't enough fuel getting through to fire up. It's not until the temperature comes down again and enough fuel can get through for the engine to start. Take it to a Mitsubishi specialist and have them go through the fuel system for you.