Serious Problem

Hey guys I have a serious problem with my 2002 zx2 I have been noticing a sound like a dragging sound when I turn into a curve that goes to the left then today the drag sound was replaced by a loud knocking whenever I let off the gas it stops when I hit the gas and when I hold the brakes in . I don't know what can be causing this I have checked all my levels and evrything is full I have also checked out the bottum of the car and nothing is hanging or dragging. I recently had the tires rotated and balanced I'm at a lose here I could really use some help if anyone has suggestions that would be great thanks.I'm really starting to worry about it.

have you gone through any large mud puddles? sometimes mud can dry on to your rims and cause them to be out of balance... also mud can screw lots of other stuff up

hey thanks to everone that thought about my problem I went to local mech and found out the the tires that I had rotated 3 out of 4 of the tires the lug nuts were loose and that was what was making that noise he also said that I was very lucky that they didn't come off on me so thanks for your help