Originally Posted by willp621

Just went through this on my 95 C-280. Ultimately, my problem was the connectors that connect the 3 coils to the spark plugs. Check those for signs of arcing (burn marks)....you can also check the plugs and wires. If even one of these connectors is bad it will throw the whole engine out of whack. Start with these components as they are inexpensive and can be changed easily.