C230 Starting problem (warm weather)
 

Need help. I have a 99 C230 Komp sport. Last fall I was experiencing rough idle at startup which I initially thought may be a fuel delivery problem. When the cold weather came the problem went away. Now that the warmer weather is back the car idles extremely rough for 10 to 15 seconds at startup. If I turn off quickly and restart it starts fine the second time. Problem only occurs when the car is being started after sitting for over 24 hours. There are no service lights on. Before I take to the dealer I would appreciate any suggestions on what may be causing the problem. FYI car has only 25,000 km and all parts are original.