1991 and older 300E's start out in second gear, not first, which is why your car is sluggish off the line.
You have to replace the valve body in the transmission to always start out in first gear.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".