Tony wrote on 11. Dec 2009 at 11:46:
Hi all
it has been a long time since i posted on here (good i guess)
Car is an Omega B estate 2.0l 16v LHD (German) 1996. (pre face lift)
It is running like a dream on motor ways etc... apart from in the last week it is having problems ticking over. It started with the revs dropping to about 500 at traffic lights and was lumpy. but now it stalls on me when i dip the clutch approching the lights, i now have to toe and heel it whilst at the lights which as you can guess is a pain.
In the past the revs have sat at 2000 sometimes when i have left the moter way and sitting at the lights, to solve this i used to remove a thin black plastic pipe from a round disk affair near the top of the engine, this seemed to solve this problem, but as it was not very often i did not worry too much about it.
So any ideas as to where i start to fix this problem,
Thanks in advance
Tony
Not sure what you mean by this, sounds like a breather pipe?

Check thats not blocked (see 2.0 breather cleaning guide in the maint section)
Secondly give the ICV (Idle control valve) a darn good clean, as that controls idle revs