Is there coolant in the small rubber line on the idle control valve?
There's more then one rubber line connected to the throttle body assembly. If you're sure its connected to the IACV, its probably a vacuum line. If its the two lines on the left of the throttle body, its the rotary air control valve that operates using coolant.
Here's a pic of the lines I'm referring to:
Here's a pic of the lines I'm referring to:
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