Poor Acceration , before & After ,tune-up

Recently I performed a normal tune up on My 1986, 190E 2.3.
I replaced the plugs, wires,Rotor and Distribtor Cap.
This was done with the hope of improving accceration
performance. I have not notice a great deal of change
before and after tune-up. Is there some other part that
should be changed. Air filter and oil change were also performed.
The engine does not appear to be using any oil. But seems sluggish upon take off.