Is this a new problem or existing from new? Sometimes construction debris can get into the lines and pile up at the elbows or where the pipes go into the faucet. Check the screens first, but if it doesn't help then disassemble the faucet itself and see if there is any constriction in there. the fact that it is only happening to one faucet AND both hot and cold suggest it is in the faucet or the screen at the tap.
2007 Chevy 2500HD Classic LBZ Duramax/Allison (Stock)
2005 Bigfoot 1500C8.2 AWESOME