Originally Posted by REVN128
My '09 128i idled rough at start and had occasional hesitation when accelerating. It was the Eccentric Shaft Sensor.
For my car other than the early morning cold start issue (when leaving it overnight) I have no problems with hesitation in acceleration, or any rough idling as it is pretty stable through out.
Since my car is running fine for the rest of the day, I don't think its HPFP as that would play up any time of the day. I think the injectors are most probably it, will see if we can confirm it today.