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I had this problem on my 325. noticed it and ignored it for a couple months as it would idle rough on and off. then one of my coils went out. took it to my friend (bmw tech) and he said that my battery was going out and needed to be replaced. thats what caused the coil to go out and idle rough. so he replaced the coil and battery, and i had him replace all the spark plugs while at it just for good measure.
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