Fairly straight forward. Remove the air intak hose assy going to T body. Get a can of carb cleaner and begin spraying the inside of the t body till nice and clean. You will also want to open the throttle /butterfly by hand to be sure the butterfly plate is clean on bothe sides. Once you have done this, go to item 31 shown in pic belwo. It is the IAC or iodle control valve. It scrwsw into the side of the throttle body. Unplug it and then unscrew it. Once in hand, clean it real good with the carb cleaner. Reinstall.
You may have a little ahrd time getting the truck to fire up. Just hold the pedal to the floor as you are cranking engine. It will start. Run doe couple minutes and repeat JUST cleaning the inside of T body. you do not need to take IAC out a second time. Put a can of good fuel injector cleaner in the gas tank and you should be just fine