Hello, I am new to this please bear with me. I have a problem with my kitchen faucet.. both the hot and cold run fine for about 20 seconds then the pressure goes down to a trickle. However, the sprayer works fine. The faucet was installed about 5 years ago and never was a problem.
Thanks,
Have a Merry Christmas!
Miguel Jimenez

No big deal! What's happened is that installing the faucet and connecting the supplies you've disturbed some crud and mineral build up on the pipe walls and it's now blocking the inlet ports of the ceramic cartridge.
To repair this , first turn off the water at the angle stops located in the cabinet. Now remove the handle and everything including the cartridge. Check and clear the inlet ports. Now place a pan over the open faucet to prevent splash and open up the angle stops for a minute to flush any crud that may be remaining out and reassemble and test.