Sorry to hear about the many problems with the car..your description of the symtoms and general information about the car are so vague that it is hard to determine what could be the problem with it. How many miles? how long have you had it? is it a 4 cyl? Does it have compression? You need to collect information first before you can diagnose the problem

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1996 E320
2000 C230 Kompressor
1988 190e 2.3 - 225K miles, owned for 7 years. I cannot say enough good things about this car. Very well built, even at 225 it ran like new.