The age old question, what the hell causes it?
For the non idle control valve car most people (me too) have tried loads of things to cure it.
This week I ave been mostly looking at the coasting air valve. If you pinch its tube to the inlet manifold the idle speed drops. It shouldn't be letting air in on idle should it?
Anyone ever set one up with a vacume guage (as per haynes), did it cure the sticking revs?
Any ideas on the subject?