I want to adjust the idle speed as it is to low but can’t see what type of screw is in the housing by the throttle cable pulley. It is bit tight so don’t want to put a driver in until I know it is the right fit. Does anyone know what screwdriver size head I should use and is there anything else like an alley key locking this adjuster in place. I’ve put this post on my Judder question and also as a new topic.

You will find it is computer adjustment (service tech II).

Hi Keith, yep hear what you say but you can also adjust the throttle idle at the point where the cable returns home by adjusting the return home screw. I have always adjusted idle at this point on all my cars but on the PT it is quiet small to get into and see the type of screw it is, it looks like an Allen key but it could be one of those funny shaped screws (if that makes sense) and before I try and turn it, as it is tight, I want to make sure I have the right driver in it first.