Help, this 5.0 f-150 idles too high!!

[Coupe5oh]

And this thing has good power, well it is a 5.0, no real problems when my dad had it, the tranny is starting to slip a little, its a company truck, i was trying to make a quick 50$ off it,

im gonna try and reset the computer, it has been a good truck, but a previous employee ran it out of oil, and it started knocking, and screwed the oil pump, they replaced the oil pump, and it runs good, well except the idle. anyone else?? I recomend a 5.0l f150 if your in need of a truck, i seen them last even longer than this one, and this one has been abused, has towed more weight than it should have in its time.