Why isn't a Throttle Control Valve part of your repair possibilities? on 1997 Ford Expedition

Need price for Throttle Control Valve?

Asked by for the 1997 Ford Expedition
do you mean idle air control?
Yes, I think it is called IAC (Idle Air Control Valve). I looked on line and the price range for the part is $50 to $80, but I don't know the labor cost in PA in zip code 19040.
Or How much of an hour will it take to install since it sits right on top rear of the 5.4L engine.