Want this question answered?
The idle is not adjustible. You may need to clean the throttle plate to improve the idle.
You don't, It is totally controlled by the PCM using the IAC valve.
You adjust idle with idle timing
1978 80 Mercury Outboard IDLE ADJUSTMENT
check fuse 22
Turn the Idle Adjusting screw.
on top of the upper intake there is a screw. it can be used to adjust idle speed.
Computer controlled? Not adjustable
There should be an idle screw right by or under your throttle
check pcv hose elbow for vacuum leak.
Idle speed is set by the PCM and IS NOT ADJUSTABLE.
You can't - it's all controlled from the PCM.