Ive got a saff cossie 4x4 and the engine has been idling crap for a few months now.It normaly idles at over 1000 rpm.When i disconnect the idle speed contorl valve it idles at about 7.50/8.50rpm.I know the revs will drop when the iscv is unplugged.Does the base idle need setting up.Sometimes when i im warming my car up on a morning before i go to work the revs go up and down a few times every now and then.Do i have a faulty iscv.Ive cleaned the valve out many a time too and lubed.Any help would be great people.