The slide stop is above the air screw. Your manual should tell you how many turns from lightly closed, (all the way in) that the air screw(usually about 1 1/2 turns out) and the choke adjuster also. The slide stop is just that, if you turn it all the way in, the slide will not close all the way, dare I say idle? The end of the stop can get worn off, and the slide can wear a divot in it where the stop has been hitting it, its all brass parts. After adjusting the choke to its factory setting, adjust the air screw till it revs the highest, then turn it in and count how many turns out you were at. This will tell you if you have the correct pilot jet, or which way to go, leaner or richer. I would have the slide stop turned out so the slide bottoms out, up to this point, then turn it in till you reach your desired idle.