how do you lower the idle on my 95 buick v6 it idles at about 35 mph.

well you have and idle air control solenoid or poss vac leak.the idle screw is under a small silver cap but i don't think it will help if the cover is there,look for a vac leak 1st

The base idle is a factory adjustment. It can be changed by the above screw. If the screw needs to be adjusted to correct an incorrect idle speed there is something wrong. The idle speed is computer controlled, with a electrical air bypass (IAC).