Have Ford Questions? Ask a Mechanic for Answers ASAP
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Your check engine light flashing means the computer system is detecting a direct engine misfire usually due to either a failing coil and or a spark plug. When the light comes on and flashes the computer will detect the cylinder that is dropping out and set a fault code for that cylinder so you know where to start. In order to determine which cylinder is failing you are going to need to start first with having the computer system scanned and the fault code retrieved. Most auto parts store such as Auto Zone will do this scan for you at no charge. If you can get this done and post back with the results I can direct you in the correct repair.
Post back here when you ready and we can work from there and thank you as well.