I think marcus318 and I have a similar problem. My c220 will start great if the temp is in the 30's or colder. After the car has been run, if you let it sit more than 15-30 minutes it won't start unless you depress the throttle. Then when it does start it jumps up to 2,000 rpm then tries to stall out (no gas) and then goes to 1,200 rpm and runs rough for about a minute and then smooths out and idles down to 700-750 rpm like it is supposed to. After getting it started it runs like new. I think it's not getting enough gas and trying to start too lean. The ECU is either faulty or not getting the proper input from the intake air temp sensor or the lead from the ignition switch, which richens the fuel mixture while cranking the engine over. My local MB dealer can't find any codes in the ECU and they say they've tested it and can't find the problem. It could also be a wiring harness problem with some of the wires or connectors making intermitent connections.