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if check engine light is flashing engine is misfiring It could be only a little hole on the gasoline pipe. cause the system must be pressurise and if is not the "check engine" will flash. the light only stays on if there is a drivibility problem it will flash if there is a slight problem and the computer in the truck will fix itself or at least try to goto a place to get the OBD II test ran on it and it should tell you whats wrong

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Q: Why would the check engine light in a 1997 F-150 go on and off?
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