Hey had a quick question, do I still have to hook up/have the IAC valve if I'm tuning with Neptune?

 

yes i believe so, neptune uses this to raise or lower the idle if needed at times so yes i do think you still have to have it hooked up..
i know on hondata you can turn it off and not use it, but that is mainly for the ITB'S

 

No, the IAC is not required, you can disable the check for it. It is recommended to have it though..