My kitchen faucet only has a very small trickle coming out of it when turned on completely, but the sprayer works perfectly and has full pressure. The faucet pressure is the same for both hot and cold water. We checked the aerator, and that is clean. Please help!

If the aerator's clean then the blockage's in the valve body itself. Shut the water off to the faucet and open up the valve. Check and clean the inlet ports on the cartridge. Before you button up turn the water back on for a moment to flush out the supplies and valve body. You should have a full stream. If you do then reassemble and test. Good luck, Tom