There are two set of "big ones" a.k.a secondaries. The air valves (upper butterflies) should easily open when you press on them with your finger and return close. Normally they are sucked open by the engine vacuum. They tend to bind up sometimes and not open/close.
The throttle plates (lower butterflies) sometimes don't open because a linkage stop on the passenger side prevents it (when cold?). But if you work the linkages by hand, you should see a "pointer" on the driver's side of the throttle shaft move from 12:00 to 3:00. If it doesn't, try unhooking the throttle cable and TV cable and then see if it opens. Two of my cars had the wrong cables which kept the secondaries from opening.