Plz Help Daewoo Cielo 1996 Pwr Lamp On Dashboard Flashing

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plz help my car is daewoo cielo 1996(automatic transmition)
this thing happen suddenly when i was going to my work PWR lamP is flashing then all dashboard lamps flash for 2sec and car turned off,after that i start the car normally but now when walking for about 1km the PWR lamp is always flashing and i feel the profrmance of the car decreased any idea what is the problem thanxxx