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One of the upper radiator hoses on my 320i developed a small hole. Most or all of the radiator fluid was lost and the engine overheated. All the hoses have been replaced. But now, the car doesn't seem to run right. The engine seems to be running rougher than before. I'd say that the engine is not as smooth and quiet as before. There seems to be more "knock" or vibration at idle. The engine seems to lack power. The car is definitely driveable, and works OK. It may all be a coincidence, but all these things happened yesterday. If any of you have any suggestions as to what could be the problem, I'd appreciate it very much. Thanks !