Seems like were all having the same new f n issue

My car idles at 3000 with idle all the way out but when i unplug the iac it goes all the way down to almost nothing the idle that is. Pulled the tb and the iac cleaned them vary well even switched tb but not iac do not have one of them after it warms up the idle will go real high for a little bit then real low for a little bit when it idles high its not missing but when it idles low it miss bad just put new plugs gap at .47
plug wires changed distribiters ive changed to 3 different computers put new injector caps and o rings im thinking its the Iac but in stead of spending tons more money Ill see what you guys think