Deb definitely gave you some great advice! The other thing that I would do is repack the entire hub... there are bearings inside the freehub as well, and everything might simply be dry. A quick way that you can test that is take the wheel off the bike and hold the wheel in your hands so that you are holding onto the axle(not the quick release) when you spin the wheel it should feel very smooth. If it doesn't, or it seems to catch, have the entire hub repacked and check the pawls as well. Good Luck!