Toilets, Sinks, Showers, Tubs and Disposals - weird water pressure problem

the water that comes out of my kitchen faucet changes pressure mid-stream. when i turn on either hot or cold it comes out very strong for about 10-20 seconds and then the pressure drops. it did not always do this, it just randomly started happening. so i took the entire faucet apart so all that was left was the hose that goes into the faucet (i have one of those faucets where you can pull the head out). i even detached the hose to see if there was anything blocking it up. then i re-attached the hose and tested both hot and cold separately...same problem with pressure. i should ad that when the pressure drops the flexible hose tenses up like something is inside it blocking the water stream. the water also comes out as more of a spray instead of a steady stream when the pressure is good. this makes me think that there is something stuck in the hose but when i blow thru it or run water thru it slowly it works fine. before i go calling a plumber i'd like to see if anyone here could help me out with this problem. it only happens in the kitchen. no problem in the bathroom. thanks :wall:

I am drawing a blank on the name of this type of back-drain valve but perhaps the faucet incorporates the type of valve that opens up to let air in after it is shut off. Without such a valve in a sprayer that has a hose, the hose can start twisting and knotting up. I recently had to actually REMOVE such a defective valve (built in, could not be fixed) in one of those hand held shower sprayers, and noticed that I was able to restore water pressure at the expense of the hose trying to start corkscrewing every time I shut off the water.

Anyway, there is probably some sort of divertor valve or such valve device I speak of inside the valvebody under the spout, that is giving you issues.

under the spout of the hose itself? i am still having the problem after completely removing the faucet and just letting the water come thru the hose.

Any diverter or other valve device would be under the cylindrical vertical portion of the faucet.

Could you explain what you did better. I don't know exactly what you mean about having the faucet disconnected yet letting water out the hose.