As I'm driving down the road when I am lightly pressing on the throttle and lightly on and off the throttle I get a metalic clunking sound that keeps clunking until I change the throttle. Sometimes its hard to adjust the throttle to get it to do this.

I checked under the car and to my un trained eye everything appears to be normal.

Is the diff or shaft buggered? or is something loose?

Any ideas on things I can check or do would be really appreciated.

Thank-you