Many times this is caused by crud in the faucet. It can be in the control valve or the screen in the faucet or spray nozzle. Remove the faucet screen ( unscrew the aerator screen ) and clean it. Remove the sprayer nozzle and clean it. If still not working may be in the faucet valve. With screens aerator screen removed, try moving faucet control around to try to dislodge it. If still not working, you may have to remove faucet to clean it.
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