Sorry been busy, grad student + exam time = sux to be me

So, the FIV has coolant flowing through it once the thermostat has opened. All ICE (internal combustion engines) run best in a window of temperature. So until its brought up to approx that temp your thermostat is closed. Once above that, coolant flows. Including to your FIV/IACV. Before that happens the FIV is open, letting more air into the TB, and marginally increasing your idle & running rich, this is REALLY obvious when its cold. Otherwise, not so much. Once the coolant reaches the FIV, it heats up a wax plug that then closes the FIV. Only the FIV is on the TB....

The IACV is on the front of your intake manifold (IM) it looks something like the FIV, and IIRC the line out of the FIV runs to the IACV or vice versa...in either case, both can be removed, and with a thin piece of aluminum can be layered between the valve and the TB/IM. I know I used a Coke can to help a friend out with this when we didn't have anything else handy.