When the MIL (Malfunction Indicator Lamp) flashes, it's the ECM's way of telling you it detected a problem, and it wants to tell you about it. You then need to ask it what's up. This is done by running the KOEO and KOER self tests. If you are unfamiliar with this, I suggest going to your local auto parts store and spending $25 on a Ford Code Scanner. This will come with a tool that makes it easier, and instructions for exactly what you should do. Once you pull the codes, post them here and we will be able to better help you.
Take care,
-Chris
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