Idling to high,after changing injector assembly and fuel assembly on 1996 GMC Yukon

How do I reset the idle??

Asked by for the 1996 GMC Yukon
Check for vacuum leak.
I did that thanks,i'm hearing that it is computer set idle.To take battery off for 15 mins,then go out on highway at steady speed for about 1/2 a hour.That's about how long it takes for computer to go back to factory setting! this true????