Idle speed problem

[Kas]

I have a problem with idle speed. It is about 1800 rpm and that is a way too much, I noticed that air valve whos job is to raise idle speed when engine is cold is not working good and I put som rubber part in hole of that valve and speed fall a bit down, at about 1200 rpm but that is also too much. Becouse I "close" that valve ( under TPS ) engine revs vhen is cold at about 800 rpm but whe warm up, idle is at about 1200 rpm.


Have someone got any clue what is wrong?

I know that everything is old and I suppose that maybe "round metal part on intake conected to gas pedal" is worned up and bad air is circulating near that plate.

Does some one have got some similliar problem and sucessfuly solved it?

Thanks, Kas