I installed a price pfister kitchen faucet yesterday. It's a single handle with side spray, model F-WK1-68 Classic. When hot or cold water is turned on, there is a loud 'thunk" and the faucet shakes. I have never had this problem before with the old faucet. If I turn the water off and then on again, it does not make any noise. But if I wait a few minutes and then turn it on, it makes the "thunk". I can see the faucet shake. Also, although the faucet is screwed down solidly to the stainless sink and the trim ring is also screwed down, the faucet seems to have excessive wobble. I posted a 10 second video of the "thunk" and wobble problem http://tinypic.com/player.php?v=2e4yg4l&s=7Thanks!