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You need to seek a professional. There could be a multitude of problems. You could have a loose part in the engine bay, or you could have an oil problem, or you could have a transmission problem, anything. I would personally say you have sludge in your engine, depends on mileage and how you drive it. Of course I don't own a Focus. Again more reason to seek a professional.

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Q: What is the problem when the engine light switchs on and the revs are very low when at idle on a 2000 focus?
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