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If your check engine light comes on and STAYS ON, a malfunction has occurred that is effecting the emission control system If the light comes on and then goes off , occasionally , the malfunction has corrected itself If the light flashes on and off at 1 second intervals , a spark plug misfire has been detected

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Q: I have a Ford ranger 1990 4.0 4x4 and the check engine light comes on and off some times What is wrong?
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