Originally Posted by bwheitman

First of all don't ever disconnect the battery while the car is running, that really freaks out a benz! I used to do that on my old cars to determine if the alternator was working, but on a benz if you do it you can really mess something up. If you had it at idle, then after it warmed up and started missing, that sounds to me like a vac leak. The computer will try to compensate by adjusting in and out the TBA and if it can not the engine will die. It will also go into limp mode. Check your vac lines, especially the one that goes right into the firewall from the engine's intake manifold. After you determine if there are no vac leaks go to the basics, fuel and ignition. Is the engine cranking now? Did you just buy this car or something? Seems like you are having a lot of trouble. Be patient, after you get the bugs worked out you will love the car, take your time and don't get in a hurry, they are easy to work on and usually nothing major goes wrong unless they are neglected or someone repairs them incorrectly. Good luck.
Brian