Re: 94 mustang cobra code 172
I think the threaded screw has a nut on it. If you loosen that nut you can turn the threaded piece with a pair of pliers and then lock that nut back down when you get it set.
As for the other part, what they mean is to blip/goose the throttle open real quickly, let it settle back down to idle, and see where the idle is at.