zrs6v4

I have a 95 240sx with s14 sr swap. Its clean but has been running rough from idle to about 3500 rpms. When cruising at 3,000 rpms it cuts out a bit. I believe I have it to the iacv, but maybe you can chime in. I pulled the iacv vacuum hose out of my intercooler piping so the iacv would not get vacuum or whatever. With the vacuum to the iacv off the car runs perfect except dies if i dont keep reving it when stopped but with the iacv vacuum on it runs terrible. Ive never had an iacv issue so im not sure if i need to just clean it or if i needed to replace it.

Any advice?