Designing Kitchens and Bathrooms - Low pressure and slow shut off problem

My kitchen faucet is an American Standard Colony Soft. (http://www.americanstandard-us.com/Products/productDetail.aspx?area=&cat=&prodID=1406) Recently, it began to function strangely. The pressure has decreased and when the faucet is shut off the water continues to flow for several seconds afterwards. Things I tried so far that have not fixed the problem:

1) Checked the pressure in the rest of the house.
2) Checked the shut off valves for kitchen sink
3) Cleaned the aerator
4) Replaced the valves

Any other suggestions?

Thank you in advance for any assistance.

Timoteob

If you have a sprayer, the problem is probably the diverter sticking. Refer back to your link and look at the repair parts. Usually easy and inexpensive to replace.

goldstar,

Thanks for the suggestion. I will try replacing the diverter.