its the main relay.

What happens is the car will run fine when it cools down because the relay isnt hot. When it gets hot, it loses connection and causes the car to die.

The main relay controls power to the ECU which controls the Fuel Pump.

So, go hit up a junkyard an get another main relay, its located under the driver side dash abover the fuse panel. Should say MITSUBA on it.

Shouldnt cost more than $20