Not sure if this is manually adjustable,
think the idle speed actuator controls
Is you'res hunting, or is it too slow or
Try taking the inlet system off and giving
it all a good clean first (filter box,Air flow
meter and the connecting pipe to the inlet,
where the butterfly valve is)
I did this on mine when it was hunting at idle
and its been fine since.
If you adjust the cable to "slow" the idle,
the only difference will be a slacker cable.
It won't slow it up as the "idle screw" is non adjustable and it will still sit on it in the
same position if you see what i mean.
You can adjust it to "speed up" the idle,
but then it won't sit on the "idle screw".
The idle cannot be adjusted manually as it is controlled electronically by the ecu and the idle control unit,it should idle about 1000rpm when cold and down to 700-750rpm when warm.This is determined by the coolant sensor.
Interesting, I suppose the ecu calculates the engine speed by the revolutions from the tdc sensor and the water temp sensor.
Second question, my aux-valve closes off completely when the engine is first started - hot or cold, is this normal V6 owners?