1991 3.0L High Idle (3000 RPM)

[EvilNavyGinger]

I manually closed the FIAV (which is supplied by the second bypass hole in the throttle body). The FIAV spring was stuck open, which is apparently pretty common in these DSM engines. I looped the coolant lines, and the high idle is gone. I backed off the throttle plate screw to lower the idle just a bit more, and now it's golden.

I'm having a similar issue. 1500-1700 RPM idle. New idle control valve, throttle plate is completely closed. Cheaned out throttle body, BUT I have no coolant in the system yet. Overhaul and testing still, waiting on parts and coolant is soon. No radiator installed.
Will adding coolant make the idle come down?
Does the back of your throttle body have something like this in the picture? This thing was kept running by backyard hillbillies and a bunch of stuff is rigged. I pulled the plug and there is a spring in there. The disc inside looks like it will close off the port if coolant pressure is added behind it, but I have no idea for sure.
This plug should be something else I'm sure.
EDIT-
Removed throttle body and plug. Found out it needed closed off so I shoved the plug in far enough to close the air opening. My adjuster is broke off, found half the PO left in there.
BUT idle is still around 1300.
1-- What's cold start RMP?
2--Should the IAC sound like a stun gun? Not loud, just lots of clicks. Brand new.