Hi there.

I just purchased a 2007 Mini Cooper S Turbo with 111,xxx miles as a daily driver. Over the past month, the CEL code P2188 came on (running rich). Also, the car idles slightly rough during the first start up, has a slight hesitation and when I release the gas pedal (car does a small jerking motion when I'm just letting the car roll naturally in drive gear), and occasionally a little rough idle at a red light.

So I cleaned the MAF sensor, changed the spark plugs and as well as coils. I cleared the code after this, and after about a week the code came back. I cleared it, drove it again, and came back again. So I left it alone and drove for a few more days, and the CEL now has disappeared on its own. However, I decided to just change the MAF sensor to a new one because I read that cleaning sometimes does not work and that running rich with hesitation is most likely a MAF sensor problem especially over 100k miles.

Is there anything else that I should be looking into for this issue? I just changed the MAF sensor today and test drove it. Seems to be driving fantastic with excellent acceleration. Problem is, the car is still making a hesitation/slight erratic and vibration ("chugging" noise, not sure how to describe this) on the first start up. 

Thanks in advance.