HI David.....welcome to the Forum
Those engine revs are low, could be gummed up idle control valve, it could also be a Vanos fault but could also be a sensor malfunction.
If it is a Vanos fault then I would recommend replacing the engine oil (if it is due/overdue) and refiling with a quality brand.
As the Vanos system relies on good oil pressure to operate then this could be a simple fix.
If it is a sensor then you should be able to extract a fault code or two from the ECU and therefore narrow down the possible cause of the lumpiness.
Also, as there is no Engine Management light displaying then it is more than likely a mechanical issue.
Let us know what you find