We cleaned our price pfister faucet because we had low cold water pressure - when we hooked it back up and put the handle back on the water will not turn off.

turn on the shut offs under sink

If you have full pressure on the cold water side and low pressure on the hot side then you well need to remove and clean or replace the cartridge for the hot side. If you have low water pressure on both sides try removing the aerator and cleaning it.
If you need to replace the cartridge on the hot side do both sides while you at it.
Whenever you work on any faucet before you turn the water on remove the aerator and run the water for a few seconds then replace the aerator.

Before trying to get into the faucet it may be as simple as cleaning the aerator. Thiis video may not look like your faucet but it will give you the idea.

http://www.bing.com/videos/watch/video/how-to-fix-a-faucet-with-low-water-pressure/25200a26d2a87598b10025200a26d2a87598b100-415628723419?q=clean+out+faucet+aerater++instructions&FROM=LKVR5&GT1=LKVR5&FORM=LKVR

Remove and clean the Price Pfister aerator. Turn the water on after you remove the aerator and check the flow-rate. Many new Lavatory and kitchen faucets are now equipped with Eco friendly water saver aerators. if the flow is normal without the aerator, the faucet is OK. if you want more water flow from your lavatory faucet, you will need to buy one of the old style high flow aerators from your hardware store. If you remove the aerator and still get low pressure from both hot and cold faucets, you may need to replace the faucet. Call the Price Pfister warranty phone number that came with your faucet.

On this valve the hot/cold in reverse is easy enough to fix, but the faucet dripping at the handle is another issue. To reverse the hot and cold, turn off the house water, relieve the pressure by opening a nearby faucet. Once the water stops, remove the handle and faucet cover so you can see the valve. then the four screws that are visible need to be removed. Mark one of the screw holes with a crayon or pencil and then remove by pulling straight out. Once out, inspect the main o-ring right behind where it sits against the valve, (if this is damaged, it might be why the handle area is leaking) then turn the whole assembly clockwise 180 degrees then insert straight back in and insert screws. Tighten screws until snug. Turn water back on before installing cover and handle to check for leaks. If no leaks are found, install cover and handle and check for proper position of hot and cold. If there are leaks, tighten screws in clockwise rotation tightening each screw a quarter turn, then moving to the next one until dripping stops. If dripping is from center of stem, where the handle attaches, you will need to contact Price Pfister to request a replacement. They are very good to work with. Good luck.

It's likely that you have some sediment that has accumulated in the cold water valve and has clogged it. The model number you have cited above is only for the trim (rather than for the valves behind it). Assuming that you have a Price Pfister valve, they don't have built in filters, so you're probably going to have to either clean or replace the valve.

it souns like a factory flaw in the piping or whoever hooked it up, over bent or kinked the line

Three possible reasons for low pressure. 1. faucet cartridge has debris in valve body. 2. aerator has debris ,just unscrew and clean out. 3. Water valves under sink are not opened up. hope this helps

check the sprayer handle by disconnecting and blowing into it and pressing sprayer handle and/or for possible kink at main body or hose by disconnected sprayer point hose into sink and turn on water. If no water the the diverter in main body is not working properly and needs to be reassembled or replaced

Your problem is a simple one.

1. Turn off water to faucet.
2. Place a towel(s) in the base of the sink(s) to prevent any parts from going down drain.
   
3. Remove the handle to the faucet. (single handle only)
   
4. If not a single handle then remove spout from faucet.
5. If a single handle remove cap carefully and any loose parts.
6. Gently turn spout side to side while lifting to remove.
7. You will see a hole with a very small valve where the water comes out to the spout on the base of the faucet.

1. Remove this valve (which is a backflow preventer) and replace.
2. Reassemble and test.
   

Problem solved.