Is there any reason you can think of that would cause my kitchen sink sprayer to work only when I'm using low water pressure? If I turn the faucet above about midway, the sprayer only drips water. If I reduce it, it sprays fine. Thank you for any guidance you might be able to provide!

Remove the sprayer nosel and direct in into the sink, turn on the faucet full blast. What comes out of the tube?

Thanks for the suggestion... I will try it after morning carpool and let you know what happens :)

OK night time how did it work?

I removed the nozzle and had free flowing water from the hose (regardless of the pressure coming from the tap control). I'm assuming that there is some type of blockage or damage inside the sprayer. I guess I need to try a new sprayer attachment?

You can buy a replacement sprayer for about $4 but the old one can be disassembled and cleaned. The tip unscrews so you can clean the screen. Likely clogged with bits of white junk.