My wife's slk230 just got back from the shop for a valve job ( burned valve), and a new timing chain @ 129k. She has had the car back less than 3 weeks and when she started it today I noticed it sputtered a bit at first. So, I removed the plug/ coil pack cover to have a look and I didn't even need to remove the plugs---they were submersed in oil in the well. What in the world did the mechanic do wrong or forget to do. I Am going to take it to him Monday and I would like to know what to say. Anyone have any ideas? Could it be a valve cover gasket or some O rings that go under the rocker arms or what??? Thanks to one and all. This is my first time on the forum.