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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner till early morning.
Hello again Chris here,
IAC is idle air control valve. It is mounted on the throttle body and controls the air into the engine at closed throttle.
They are sensitive to moisture in the air that can freeze. Normally the valve is strong enough to move even with some frozen condensation but not if it is weak and worn needing to be replaced.
At a parts store about 60$
It takes about 15 minutes. Disconnect the negative battery cable, unplug the IAC, remove the 2 IAC screws, replace the IAC and connect it and the battery. I think they are 8 mm screws.