After replacing the throttlebody and related connections (long story short my tb got stolen) my rough idle started actin a whole lot wierder. Now for the first minute it idles between 4000 and 4500. After that, itll drop down and hunt from 1200ish to about 2200ish. I read that if your o2 sensor is bad itll continue to run in closed loop* (at startup, it dumps a fixed amount of fuel despite the afr until its at operating temp, then changes to open loop*, adjusting to afr) Im also aware that if the iac is clogged it will hinder the idle. Any thoughts? Is there anything I didnt consider?

*the terms could be backwards, its too early for me lol