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[omegaman74]

i have a 1994 omega 2 litre 16v estate,my problem is that when i pull up at traffic lights etc the car revs at about 2000rpm then after about 3-4 seconds the revs drop and ticks over at about 900rpm and the engiine light comes on and ticks over roughly but when i pull off again the car seems to run ok and the light goes out.i have had it on the car diagnostics and it comes up with the mass airflow sensor,i have changed this with a brand new gm part but it still does the same thing,so a friend suggested changing the idle air control valve,but still the same,even when car is idling i disconnected the idle valve connector but still the same,anyone got any ideas as i love this car been with me for 7 years now and dont want to get rid of her.PLEASE HELP.

[Auto Addict]

Give the throttle body and breathers a good clean out.

There's 'How to' in the Maintenance Guides.

[Abiton]

  Paperclip it (again) to see if you still have any fault codes.

[omegaman74]

Cheers i will try these tomorrow and let you know how i get on.

[Vegar]

Agree with auto addict. Im having similar problems and cleaning the IACV and throttle housing is the best place to start.
Guides:
http://www.omegaowners.com/forum/YaBB.pl?num=1194007453
http://www.omegaowners.com/forum/YaBB.pl?num=1207387811

[omegaman74]

idle control valve is brand new only been on a couple of days and only done about 3 miles,have sprayed carb cleaner into throttle housing and thats all nice and clean now but still same problem.....