I noticed recently that my car is dipping to about 800rpm when warm and stopped in traffic. It doesn't hunt up and down, or it doesn;t cut out at all, but it sits about 50 - 100rpm lower than it should (and used to) as I can hear the low rumble in the exhaust if you know what I mean. Just wondering do I just adjust the screw when car is warm and idleing till its at about 850rpm etc until its where it should be? I reckon I only need to bring it up 50rpm to be where it should be.
I don't think the stepper is knackered as there are no other problems, just that its idleing about 50rpm below normal and feels a little strained.
cheers.