It's not a sensor - it is a valve. It is the shiny cylindrical unit bolted
cross-ways across the top of the throttle body. If you don't know where the
throttle body is then don't start messing with the EFI system.

You can remove it and check that it is clean and seating & sealing properly.
If you are having a problem with hunting idle then you probably have a
sensor fault elsewhere - often with the power steering pressure switch or
TPS.

In any case the first place I would start here is with ECU codes. See
www.fordmods.com.

Pat.