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I had juddering problem and too much virbation with engine management light on....took it to BMW garage and they recommended to replace all injectors, coils and spark plugs......as I bought my car from an outside dealer, they did refused to pay BMW everything.
Towed the car back to the outside dealer and they changed all coils and spark plugs but only faulty injector. Car is back and running very smoothly....not quite sure for how long though.
Hope it helps.
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