hello, ive just bought a 1988 190e. Mainly when cold, it idles a bit low, and a bit up and down, when the revs are brought up, it runs fine. Would this be a problem with the idle control valve? either faulty or connections need cleaning? or would it be the automatic choke? If i could have some help with this, if someones had the same problem, or knows about it,it would be great.

thanks, max