A couple of months out of warranty my 2003 C 230 Kompressor Coupe (50K miles, automatic) has started to give me a CEL with a P301 (Cyl 1 Misfire) only when the engine is warm and I put it in neutral or park. I can drive it all day, it idles fine in gear, but if I take it out of gear it will misfire noticeably and the CEL light will come on. If I drive it, the misfire continues (rough RPM, loss of power), but if I turn off engine and restart, the problem goes away. I have tried swapping the Cyl 1 Ignition Pack, the problem remains on Cylinder 1. I have removed the #1 Spark Plug which looks OK. Any suggestions? Naturally , the first time this happened was when I pulled in forn an Emissions Test.