Don't know if this will help anyone with this all to common problem, but my idle was all over the place. Then found out I had problem with an alternator connector which had briken, it went altogether and the car stopped with a flat battery. Got the connecter replaced, battery charged etc, and never had any idle speed problems since!! Don't know if it was anything to do with this, but do know that it hasn't happened since other problem fixed. Maybe electrical supply problems like this can cause it?
Don't know if this will help anyone with this all to common problem, but my idle was all over the place. Then found out I had problem with an alternator connector which had briken, it went altogether and the car stopped with a flat battery. Got the connecter replaced, battery charged etc, and never had any idle speed problems since!! Don't know if it was anything to do with this, but do know that it hasn't happened since other problem fixed. Maybe electrical supply problems like this can cause it?