Mine has had the aux air pump removed and so the vacuum lines are not entirely standard. It dives well, with very strong power and has a lovely smooth tickover, which is at the correct level. I just notice when lifting off that it is slower to drop revs than I would like, as if there is a little too much damping to the throttle shutting and revs declining. I thought at first the cable might be a bit on the tight side, but it isn't that. It manifests itself that the car just tries to shunt you on a bit more than you'd like, say in town or going slowly generally, making you want to select a lower gear so the slightly higher momentary revs are less of an issue. Assuming there is nothing actually sticking with the linkage, which I don't believe there is, does anyone have any ideas as to what might be causing this feeling please? I reiterate that after the couple of seconds it takes to get down to its tickover, this is as smooth as silk and not too fast either. It just takes a while to decline to the correct level. Any help greatly appreciated, as ever.