My W203 facelift c220 cdi
when driving along at a steady 30mph the engine hunts and the revs go up and down slightly.
Tickover is fine , Acceleration is fine as well as kickdown, it is just at a steady 30 or 40 mph the revs go up and down and you can feel the car in sequence with it.
Ok guys ive just had my aircon re gassed looking at the controls it saying ac off and a red light for the aircon to work does the light need to be on or of = work