I tend to agree with the others that your problem is likely fuel supply related.
However (comma space) I had an intermittent problem very similar to yours, and it ended up being one bad coil wire causing the problem.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".