No water pressure in kitchen sink. Not the aerator.

1. Check the aerator: The aerator is a small mesh screen located at the end of the faucet spout. Over time, mineral buildup can clog the aerator and reduce water flow. Unscrew the aerator from the spout and clean it with a toothbrush and vinegar or a solution of water and baking soda. Rinse it thoroughly and reattach it.
2. Check the supply valves: Make sure that the supply valves under the sink are fully open. Turn them off and on a few times to loosen any debris that may be stuck in the valves.
3. Check the water pressure regulator: If your home has a water pressure regulator, it may be malfunctioning. A faulty regulator can cause low water pressure in certain areas of your home. Contact a plumber to check and replace the regulator if necessary.
4. Check for leaks: Check for leaks in the pipes under the sink or in the supply line. A leak can reduce water pressure and cause other problems.
5. Call a plumber: If you have tried these steps and the problem persists, it may be time to call a professional plumber. A plumber can diagnose the problem and recommend the best course of action to restore normal water pressure to your sink faucet.

There is normally a filter at the end of the faucet outlet. They usually unscrew. its usually a fine mesh screen with a plastic backing mount.

Clean the faucet aerator.
Always run your tubs first so junk in lines comes out tub spout, then faucet taps last with aerators removed.
http://waterheatertimer.org/Low-hot-water-pressure.html

Gene
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If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

One of the greatest things about Franke Faucets is that they have a lifetime guarantee. If you recently changed the waterlines in the home then more than likely when the water was turned back on or lines pressurized the settlement in the water main (Outside of your home) was activated and clogged the aerator. Most aerators simply turn counter clockwise (With the water off) after remooving the aerator simply clean and dislodge any particles in another sink. As for the pull out, some models have an inline screen located between the hose and the faucet handle. Simpy remove the handheld faucet (With the water off) and clean the screen.

Unthread end of faucet (aerator) where the water comes out into sink, under the aerator is a screen & a plastic valve.It has sediment & rust which will disrupt the flow & pressure.Careful not to flush it down the drain. Tip upside down, while holding it together with finger. Flush it under the faucet. It is not uncommon to get plugged up initialy because of the new installation.

It is very common when you first install any faucet, for the aerator on the very end of the faucet (where the water comes out into the sink) to plug up with rust or sediment. Because you had to turn off water supply, it churns up this sediment in pipes. It initially plugs up the filter/screen in aerator. Just unscrew the end & flush it out with water. Then reattach.

One thing you could try is to remove the aerator at the end of the spout on the faucet, Turn water on and see if pressure is any better. If so the aerator is got something in it restricting the flow.
You also can remove the dime shaped flat in the aerator to increase water flow. It looks like a dime with a hole about 1/8" in center to restrict the flow to about 1.6 gpm. Remove it and reinstall aerator and check water flow

Most of the times when cold and hot side of faucet.It would be the first thin to check being you have good water pressure at other faucets. They catch debris and the flow slows down from the faucet's. Check out supply lines and faucet for a blockage if this doesn't take care of the problem.

Check out this web sire for a parts breakdown of parts in faucet. Check out installation and rough in sheet for information on faucet below.
http://www.needplumbingsupplies.com/Kohler-Kitchen-Sink-Faucets.asp?id=3628

Try removing the aerator on the faucet. If that resolves the popping sound, try replacing it with one that allows for a higher flow of water. (Also the existing aerator may be clogged).

remove aerator and cart. and soak in limeaway over night

Their is likely rust build up behind the valve connections to the hot and possibly cold water supply lines. Turn the water off to the house relieve the pressure and remove both valves. Once removed use a screwdriver to break up the rust. With a small bucket under both lines turn the water main back on slightly to clear rust. Replace both valves with new ones.

I’m happy to help further over the phone at https://www.6ya.com/expert/josh_87ce33216d7b2148