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If its the M62 4.4l like what is in the 540i & 740i around that age it is possibly the Oil Separation Valve at the rear of the intake manifold. Start the engine and let the idle stabilise, once its settled down pull out the engine oil dip stick and see if there is a strong vacume on the dip stick tube, just put your finger over it. If the idle changes dramatically each time you place and then remove your finger, then the OSV is likely to be the issue.
This link explains the process to change it. Please confirm that it is the same engine before going too far.
Rear Manifold Cover aka. OSV | BMW 740iL | Magnum
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