O.K., I just replaced the plugs which were original from 1995 and put in new Bosch Platinum 4's. Also changed the very dirty MB airfilter with a K & N. Problem Soved! Just passed someone on the interstate in 3rd gear at around 5,000 RPM. Smooth as silk.
You're right, there's no need to rev the car in the driveway. I accidentally stomped the gas when sitting in the seat doing something else, and noticed it wouldn't go above 4k, so it made me wonder...
1995 MB E320 Wagon, 41k
1992 Land Rover Range Rover County, 186k
1996 Volvo 960 Wagon, 105k
1996 Ford "Exploder" Limited 2wd
1982 Volvo 240 GL Diesel, 157k (61k on new gas engine conv.)