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When the check engine light flashes that means there is a current misfire which usually means you have failed ignition coil. Next step is to check diagnostic codes and if gives a specific cylinder misfire code then next step is to swap that coil with another cylinder to see if misfire follows coil, if so this means coil needs to be replaced. I'd expect around a $250 job to have this done at a shop. Let me know if you have more questions, thanks.