Spray and single flow both running at same time on Moen single-handle kitchen faucet. How do I correct the problem ?

SOURCE: Leaky faucet

Finding brand specific replacement parts in stock for a 20+ yo faucet without a Mod.# is quite the task, implying that you would have to do a side by side compareson/inspection. If in fact that part is not obsolete.
Maybe you should consider replacing the entire faucet.
Good luck 

SOURCE: Loose handle on my Moen single handle kitchen faucet

Yes it is fixable and easy.To save you time because I belive you will be needing a new part from Moen I am sending you this easy link to quickly resolve your issue. Just be sure to tell Moen you are original owner of faucet and all parts are lifetime free including shipping. Go Moen!!!

http://www.moen.com/contact.cfm?location=TopNavCustomerSupport

Thanks and Please Rate jj505

Mike Butler

• 6674 Answers
• Posted on Dec 29, 2009

SOURCE: moen single handle kitchen faucet, Hot water and

Hot water line connected to left side of faucet? Did you replace tap set, or just cartridge? Cartridge may be out 180 degrees.

SOURCE: moen kitchen faucet leak from spray

This might mean that the diverter in that controls the sprayer needs replacing. It is located behind the valve body underneath the tub spout sleeving

SOURCE: The handle on my moen

you must go through the steps outlined here. http://www.moen.com/consumer-support/warranty