2010 Chevy Silverado Clicking

Ive only had my silverado a few weeks now and for 1 of those weeks it got sent to the shop to fix an a/c vent and check this clicking noise with my front tires but they said they couldn't figure out what it was. The sound is a loud clicking almost like you would hear when kids put cards in the spokes of their bikes. It only clicks when I am not accelerating and is most noticeable driving down my alley when I can hear it really well, it seems to be both front wheels