When the engine does start, it is smooth as silk. And runs like a champ. I mentioned my concerns to the local MB dealer and he thinks that it is probably a bad crank shaft sensor. What do you guys think of his assessment? He also says that for $103 he can conduct a full diagnosis which will pin point the problem for sure. Should I have the car diagnosed? What harm can come from a bad crank shaft sensor, other than it taking two times to start the car??