My question is, is an Idle Control Valve necessary when going with a full standalone?

Im going to be making my own intake manifold, using an aftermarket 75mm Mustang throttle body which has no provisions for an ICV, along with a full Microtech standalone. I fully understand how an ICV works... its basically a vacuum leak controlled by a stepper motor, solenoid, or coil that allows for better cold start driveability.

Since the standalone I will be using has full enrichment control based on coolant temperature, couldn't I just tune that? or is a vacuum leak still necessary for something other than emissions?

 

You dont need to run an IACV. If you're making a custom manifold and there is no provisionary spot for it, then you have to route the coolant lines as if there never was a valve present.

Search "Throtthe Body Bypass" or "Coolant Bypass" or IACV bypass and you'll find info on how to eliminate it all together.