I had similar problems with my 2005 4.4 x5 . dealer replaced intermediate levers under CPO. two days after I brought it back , it started acting again. Took it back to dealer. they say the lever settings were not set up correctly. I asked them to look at other possible causes such as oil separator hose, cam sensor etc ( from other thread) , he said those were unlikely causes for misfire. they will test it again in the morning (cold start)....and most likely will be bringing it back tomorrow afternoon.

It seems like replacing intermediate levers is a major work. How much would it have cost me out of warranty?