My guess would be the notorious O2 sensors. It only takes 5 min. to snap on a code reader. If you have troublle with starting occaisionally, as if flooding the engine or get black smoke when you start,I'd get that checked out pronto. There is an ECU coolant temperature sensor which will also cause the engine light to flash. If it's bad you will be washing all the oil off the walls of your cylinders with raw fuel from the over rich mixture. The part is cheap and takes less time to change that it does to read the code.
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