One thing you could try is to remove the aerator at the end of the spout on the faucet, Turn water on and see if pressure is any better. If so the aerator is got something in it restricting the flow.
You also can remove the dime shaped flat in the aerator to increase water flow. It looks like a dime with a hole about 1/8" in center to restrict the flow to about 1.6 gpm. Remove it and reinstall aerator and check water flow

Most of the times when cold and hot side of faucet.It would be the first thin to check being you have good water pressure at other faucets. They catch debris and the flow slows down from the faucet's. Check out supply lines and faucet for a blockage if this doesn't take care of the problem.

Check out this web sire for a parts breakdown of parts in faucet. Check out installation and rough in sheet for information on faucet below.
http://www.needplumbingsupplies.com/Kohler-Kitchen-Sink-Faucets.asp?id=3628