No water pressure

I just put in a new kitchen sink with shut off valves and a connection to the dishwasher. The pressure coming out of the faucet is just a dribble compared to the old one. The spray attatchment sprays very hard but the faucet itself seems to barely work. Ive followed all of the installation, maintainance, and troubleshooting guidelines and have pretty much disassembled the whole thing. There is nothing blocking it. What else could I do?