I have a lexus sc400, which when I leave the car outside under direct sunlight oe than 2-3 hours, it has a problem.  The problem is that the car starts but it will turns off right away.  The car RPM goes down from 1 to 0 and the engine shuts down.
 I have change the motor relay and still have the same problem.
 Does anyone know anything about this problem? Please help me.
 Thank you
 Daniel