Just for the record, I did a search on this, but couldn't come up with anything because it kept bring up INSTALL, and was way too broad.
On to my question... Stopped at a stop light, I felt the car rumble, and it rolled back (I pushed brake then), and the car had stalled. I couldn't figure it out? Then of course, the 1 out of 10 times that I try to start my car when warm, it wouldn't start (still need a new Overvolt Relay). So I was stuck at a stop light with my friend for a number of minutes while attempting to start the car. I really hope I didn't give MB a bad name by seeing one broken down at a stop light!!
Anyway, I had a rough idle awhile back, but got a new fuel filter and new spark plugs and the problem was cured. Right before the engine died, it stumbled like it did with the rough idle (always feels like a car has been nudged me from behind). Anyone have any idea what this could be?

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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)