wierd knocking sound?

I have a 91 Talon, Auto, N/A. I was driving home from my girl friends house when i suddenly heard a knocking or like a clicking sound. So i was like shit I must have a flat. I pulled over and checked it out. I was ok. So I got in n drove away. I noticed the knocking comeing from the drivers side by the front tire. When I press the gas it stops. when I press my brakes it stops. When Im at a complete stop it stops. I tried in nuetral and reved it but no sound. The only time it makes the sound is when I am coasting. Its not like my axels or anything I just got them replaced last month. Im thinking maybe it is my brake..maybe way too worn down? Im not sure? Can someone atleast give me some idea or what you think it is?

sorry guys i figured it out...my tire was wobbleing. Some of my lugs got loose. So I tighten them and its all good now. LoL sorry for this post.

No worries, it's a good reference for people with the same problem in the future. Nice job finding the fix!