Water just trickles out of tap - Price Pfister Plumbing

The problem most likely is a clogged aerator. That is the part that sticks out of the faucet that the water comes out of. You need to unscrew it, take it apart, and then remove any particles that are inside. Sometimes the easiest solution is to buy a new aerator at a hardware store. Take the old one in to make sure you get one that will fit.
Before replacing the aerator, run the faucet without it for a minute or so to clear out any remaining debris.
Unscrewing the aerator: Looking down on the faucet from above the sink, turn the aerator (which will be on the far side of the faucet) clockwise to remove it. You may have to grab it (carefully) with a pair of pliers. Close the drain before you do this so you don't loose any parts down the drain.