What is the idle speed on a 1987 Ford Bronco with a 351? and how do I adjust it?

If it is a carb the idle should be between 600-800 there is a screw on the front of the carb that the throttle linkage hits up against. if it is EFI then you MUST let the computer control it there is no adjusting it, if your idle seems to high or to low then your idle air control valve is not working properly.