Tobybul,, did you find out what problem? My 95 C220 seems same problem as yours. Just did wiring harness, head gasket replaced and fuel pressure regulator. Now, that car is very hard to start when the engine is warm. Cold start -- no problem at all. After driving until engine warmed up..... Turn it off and can start right up again. If wait about 5 to 10 mins, then it is hard start. After start it, still feel little shaking. *** New Bosch MAF was replaced about 3 months ago (before head gasket replaced).

Some more information, that guy helps me to replace head gasket. He put the wrong wiring on the airpump and causes 40A fuse burn when cold start. Also, put the ignition wires into wrong position for the coil. Those I fixed it up!!! I want to know that will oxygen sensor and throttle body can affect on starting!!!