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The EPC light (electronic power Control) comes on when you have a throttle problem , there are two sensors at the gas pedal and sensors at the throttle body ,you will need to scan the vehicle for trouble codes to figure which one is setting the light on.
As the first step I would clean the throttle body really good ,reset the code(EPC light) and test drive the vehicle to see if problem goes away.
Good luck , let me know.