The two that point forward go to power steering and to block them you DO NOT loop them as it just creates a bypass and keeps the idle high. You need to cap them individually. And you are talking about the top two on the IAC housing right?
The bottom ones (one that points sideways) goes to a/c idle up vsv. The other (if there, commonly found on bigports) is a small vac line for a throttle return dampner.