Faucet slow flow at first, then fine

Hello,
I recently started having an odd problem with my kitchen faucet. When I turn the faucet on, either hot or cold, the flow is very slow intially, then it sort of ramps up to normal flow. This is the only faucet in the house that does this. It's only about 1-1/2 years old (out of warranty, not that I know it's even defective). Great pressure everywhere, including this faucet once it gets running. Copper lines, so I don't expect build-up in the pipes, and again it's not limited to the hot or cold line.
I removed and inspected the ceramic cartridge, but didn't see anything odd. Same with the aerator.
Is it possible to have some sort of vacuum/air-lock build up in the line somewhere. Doesn't seem likely to me, but then I don't have a huge amount of plumbing experience.
Thanks in advance for any ideas on how to proceed troubleshooting/fixing this.
-Pete
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Peter, do you have a spray hose on the faucet? If so, the diverter valve may be giving you problems. You'd have to check the parts breakdown to see exactly where it is located, but usually this involves removing the spout. Good luck, Dean.

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Hi Dean,

It did come with a sprayer, but I don't have room for it in the sink, so I capped off the 'receptacle' where the sprayer would plug in. This is a Price-Pfister faucet and I just called their support dept. They believe it's the cartridge and are sending a replacement at no cost to me! Apparently they're warrantied for life. I'll wait and see if that makes a difference.
Thanks for the help, Pete
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