To check the FITV you can do this:
1) let your car warm up until the rad. fan comes on.
2) with the intake off stick your finger into the throttle body and cover the bottom hole toward the TPS.
3) if there is a vacuum pull at that whole in the throttle body your FITV is bad. The top hole is for your IACV. If you plug that your idle should drop.

FITV are on all models, autos, manuals from civics to preludes. Newer models have bypassed this component and simply use the IACV. On my B16 I made a thin metal plate and sandwiched it between the throttle body and FICV. Then ran the coolant hose direct from the block to the IACV. Takes longer to warm up, but the idle is always steady at 750 RPM. A new valve costs $40 and is only held on by three bolts into the throttle body. I would get new seals (3 of them) if you are going to replace it.