Because of gearing, your Mercedes is not made to be fast off the line. If you floor it into kickdown from a stop, it will engage first gear, but there's no way you're gonna peel out! In my 1995 C280, I've never peeled out by flooring it in a straight line. Neither in a 99 E430 with ESP/ASR off!
So it's normal.
Also, for your starting problem, does the engine turn? Does it usually happen when the engine is warm? Very likely the OVP, do a search on OVP, it has been discussed 3 and a half billion times. ONly a $65 dollar part.
2006 E350 w/ 155k miles (Daily Driver)
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!)