Sprayer works fine, just a trickle coming from gooseneck.Unit is only 2 yrs. Old, replaced shut-off valves below(which were 25 yrs. Old).I think particles of old rubber washers are in faucet or diverter... jnow what?? We have hard water issues. Thanks for your help. RB

Firs,t remove the aerator and see if the water flow is normal. If so, clean or replace the aerator.