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.

Go figure.

__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".