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I have a 330d with the N57 and the car had glow plug errors when I bought it and has suffered similar issues since the repair.
Glow plug faults were clearly indicated by the fault codes and the idle would be rough for a few seconds. This didn't carry over once I'd set off.
I've replaced all glow plugs and the controller.
I'd suspect you may have another issue. What was the specific air intake sensor issue fault you saw?
This "could" cause a rough idle if the MAF isn't reading the idle air correctly.
Cleaning the MAF and MAP sensors and resetting MAF adaptations showed a significant benefit in my car with smoother running and around 4mpg gained. This could help.
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