what should it act like with the idle air control valve wiring harness un hooked?

i've been having an over heating problem, and a crazy idle that rev's to 2200 and back down to 1000... and back and forth...

last night i changed the thermostat... and bled the air out of the system...

it still idled crazy.... i removed the air filter intake, and when i plug off the side hole in the TB with my finger, it idles fine....


i unplugged the harness to the idle speed control valve... and the idle got a lot lower and it stopped rev'ing up and down... but it still idles at 1300....and lopes to 1400>back to 1300>1400>1300

what should it act like with this wiring harness un hooked?