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I've had similar symptoms on two occasions in one year with my '86 528e automatic. It has a smaller engine than your car, but perhaps the cause is the same. The first time it was a bad gasket, and cost about $175 to fix, because much of the engine had to be taken apart. Before fixing it, the problem became so bad that the engine would bog and stall while waiting at traffic lights. More recently, the rough idle returned, accompanied by a hissing noise which grew louder over several weeks; this time it was a vacuum leak. I suppose the problem could be related to the solenoid as well, but I don't know where it's located. You may want to purchase a Bentley or similar repair manual.
Best wishes fixing the problem.
Craig
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