I've heard from a few that this is a common problem, but either it isn't, or I'm not searching for the right thing. My 98 C230 runs and drives fine; as long as your foot isn't on the floor. When you floor the accelerator, the engine RPM climbs, but accelerates slowly. (This is not a slipping transmission feeling; more like power loss/bogging) Let off the throttle a bit, and it upshifts and accelerates smoothly. It's quite odd, and this happens at any speed, whether the car is warm or cold. Anyone else experience this?
By the way, this has not set a CEL.

My apologies if this has been asked a zillion times, I did search for an answer first.

Thanks in advance!