These two holes are just left open, right by the CTS on the intake manifold.... i was spraying for vac leaks and sure enough my idle kicked up. Every pic i look at on peoples cars these holes are left un-capped or plugged with a bolt.. however in my case im getting a small vac leak? anybody elses have theirs covered?

 

Just blind holes in mine (nothing in them). But I'm running an Edelbrock lower manifold.

Are you testing with the bellows removed from the throttle body? The engine is most likely sucking in whatever you're spraying through the throttle body causing the increase in RPM.

 

i actually threw bolts in them, now the car idles PEREFECTLY... so there you go lol