I have actually been having rough cold start issues, with the engine performing smoothly once it is up to temperature. Experience that I have had with other cars previously is that dirty sensors can be the cause of these types of issues.
Originally Posted by DSXMachina
Never clean a MAP sensor. Avoid cleaning any other sensor, including your MAF sensor, unless there is an articulable reason for doing so.
'09 E90 335xi - M Package - Lemans Blue - 85,000k
Last edited by T.O.335; 11-14-2012 at 12:31 PM.