When the fuel trim is maxed, it can cause a misfire condition. Read the adaptation values and you'll get a much better diagnosis. I'm willing to bet the fuel trim is maxed at 1.32 and you need a new Air Mass Meter.

The flip side (not as frequent, but still happens) is that it's adapating the other way and the fuel pressure regulator is shot.

__________________
John Shellenberg
1998 C230 "Black Betty" 240K

http://img31.exs.cx/img31/4050/tophat6.gif