Q: Why does only of my faucets(fill in the blank, kitchen sink, bathroom, etc) have little or no pressure, yet the others work fine?
A: Keep it simple, unscrew the end of the faucet where the screen/filter is, see if it is clogged up, if so, clean it out, put it back on and then see if it is fixed. If not, soon I will continue the next steps to check 🙂