1991 Plymouth Acclaim Acceleration/Engine Issue? Please Help

I was driving and the engine started making this loud clicking noise. While driving the sound comes and goes although it started to become more frequent as I kept going. At first it sounded as if something was scraping against the cement below my car but when I got home I looked under and everything seemed fine. Whenever the noise happens also my accelerator pedal gives out a little. I thought that if I wasn't careful while driving that the pedal might just break and fall to the floor. The sound really sounds like there is some kind of harsh stress acting on a rubber belt. Please help, thank You.