It runs great when cold, but when the car reaches operating temperature, the idle drops dangerously low, almost to the point of dying. Also, when accelerating at operating temperature, it will stutter a lot, but will be fine when I get up to speed.

I've already
-Changed the primary o2 sensor(Was throwing a code)
-Cleaned the IACV(Was not too dirty)
-Reset the ECU at operating temperature

Help?

 

Got kinda the same problem with my 93 civic dx. My idle bounce up and down then and when accelerating it stutters real bad and has like no power. When I get up to speed it still does it on and off. When cold the the idle is good and it runs great no sputter and great power