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A flashing check engine light means there is a serious problem (as opposed to a steady light which means there's a problem). You need to have the stored codes read before trying to figure out what's wrong. Most auto parts stores will read codes for free. Then simply Google your make and model and the code and you will probably get a few results that will point you in the right direction.
you need to take to autozone or advance and let them check the computer codes. if the engine light is flashing the codes stored in computer will help if not outright identify problem..they will check codes free of charge
A flashing Check Engine light means you have a ignition Misfire, start by replacing the spark plugs and spark plug wires, one or more is defective. If you have a electronic engine control fault code reader the cylinder or cylinders that are misfiring will set a fault code, the codes are P0300-P0306, the last number being the number of the cylinder ( cylinders 1-6) the computer has detected a misfire in.
Stop by your local Advance Auto or O'Reilly Auto parts store. They will lend (Advance Auto) or rent you a Scan Tool to see what error codes have been set in the cars onboard computer. This should help diagnosis what happened when the Check Engine light went. Not sure why it went on then off. They usually stay on until you clear the codes...
Good Luck +