Feels like the wheels will fall off.. Ideas..?

Tires are pretty much brand new with no sign of wear. Upper control arm bolts (for setting camber/caster etc) are tight. I'll have to check the steering box and idler, but when I was under the car all of those felt tight with no play. I'll have to check for a crack like mentioned above. Would a loose steering box (power steering) cause something like this or would you feel it all the time?