Thanks for all the posts on Enrique and Mr. MB Motors. I took my '94 E420 there on Thursday and picked it up on Saturday morning. It had been running very poorly and idling roughly. I had looked forward to having the experience of meeting Enrique ever since I had first read so many great things about him and his shop a couple of months ago. I definitely was not disappointed and from now on I will not let anyone else work on my car. Enrique replaced the air flow sensor and the part (rebuilt) cost about $250. I checked online and a brand new one (Bosch) retails for about $850. He also replaced the purge valve and a couple of other small parts and also recharged the air conditioner which was not cooling at all. The entire bill was about $750 which I felt was most reasonable. I think that Enrique knows his stuff and is straightforward as well as honest. He mentioned a couple of other small things I might fix in the future but they were things that he did not feel were critical or anything to worry about right away. He is detail-oriented to the point that he remembered and mentioned my missing passenger side sun visor clip before I left the shop. Just add me to the list of extremely satisfied Mr. MB Motors customers.