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I have never had the injectors cleaned as it runs great other than idle. It idles at about 800 and stays there even with the a/c on. It gets good mileage however it's worth a try. I checked the PCV hose and it doesn't seem to be leaking, but it is soft in spots so I will try replacing it. This is a strange vibration. I am used to engines shaking if they have a vacuum leak or bad injector. I had a 1993 Ford Aerostar that had a vacuum leak and the engine shook badly. The Focus has a vibration like a vibrating chair or cushion. It shakes rapidly but very little travel, perhaps a 1/2 inch back and forth rapidly.
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