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check your actual fast idle valve as well under the throttle body - should have 1 coolant line that runs to it and unscrew 1 side and using a large screw driver tighten everything back down (can be done without removing the valve itself)
also could replace your IACV on teh back of teh intake manifold - or check your wires for it - wiring to the IACV gets damaged or goes out more often than the IACV itself.
could check your vac lines but check those 2 things first -
It is much easier to repair a FITV if it is removed. Especially if the plunger is "loose". You have to press very hard inward and twist. The purpose of a FITV is to hold the idle up when the engine is cold. When the coolant temp. gets warmer, the plunger inside starts to close and lower the idle. If the idle does not surge when the engine is cold, only when warm, than I do not suggest bothering with the FITV. It is most likely a vacuum leak, or a faulty IACV.
As for the wiring getting damaged, thats not very probable. There is nothing back there to damage the harness or clip. The valves arent made to last forever. Especially the FITV.
I have done several still on the motor but I can also pull it off and repair it and have it back on in like 20 minutes max.
As far as the Wiring it "goes bad" more often than the valve - the valve doesn't move much and not much to it - who said it had to be the harness or clip - pull the motor out - have a bad torque mount - have a car sit for a while - electrical problems happen - and you are obviously new if you have never seen a wire that carries a consistent signal eventually die...I've had an 88 crx SI report and suspect the IACV bad and it was wiring then even - have had my newer civics do teh same.