1994 e320 running heavy
 

hi all, i am posting again.
I have a 1994 e320, i just changed the mass air flow sensor, spark plugs, wires and boots, and had several codes which i cleared.
the car was running rough, when i reset the codes it started running smooth again, but running very sluggish and gas mileage is terrible.
every day i get the engine light, i check the code reader built in the car, i get code 23 Intake manifold pressure (in base module pressure sensor-) with engine running too high/low.
any ideas?
vac leak?
the car is still running smooth, but i did notice its running a little heavy like it doesnt wanna go.

lebstyle, what's the mileage on your 1994 E320 and when was the oxygen sensor replaced last?

A little food for thought.......how is yor catalytic converter?
Plugged, partially plugged?

the car has around 150, 000 miles. ineer changed the oxygen sensor, but its not giving me any codes. and the converter i never checked.
but te car was pretty swift before this poblem. do you think there might be a vacuum leak somewherE?