Price Pfister Low water pressure

I have a Price Pfister Savannah kitchen faucet that I have had for about 4 years now and have not had a problem with it, until last week when it just started to lose water pressure.
I checked the aerator and it was clean I even tried it with the aerator off with the same results. The sprayer has the same pressure it always has.
I pulled the cartridges out and they appear to be fine.
Do you have any idea what could be wrong.
The rest of the house has perfect water pressure as it always has.
thanks PAUL

worth a try

with a flashlite , look under the sink and see if the copper feed tubes are crimped as they come through the sink holes. if they're bumped sideways
they will crimp cutting off water. good luck

The diverter may be clogged or stuck.

am i the only one

that hates that brand?

How do I check the diverter?