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Q:

flashing check engine light on 1997 Ford Expedition

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Check engine light flashing, truck running rough.
(1) Answer
As I said in your question above, the PCM monitiors to many sensors to just be able to say for sure what your problem is without the code numbers. And parts for todays vehicles
are to expensive to just buy and not fix your problem.