When I use my Kitchen sprayer it pulsates and jumps really bad. It sounds and feels like a jack hammer. How do I fix it?

The sprayer has its own washer to actuate and stop the flow of water. From what you say I think the washer is loose and/or broken and is vibrating

Although the diverter is the usual culprit there's another problem that would give you the same chatter. Low water pressure. Until I replaced my water lines I had them same problem. Replacing the lines and increasing the pressure cured the problem. Hope this helps. Tom

Although The diverter is the usual culprict There is another problem that will make your sprayer "chatter". Low water p"chatter" when first turned on. ressure. Until I replaced my water lines my sprayer would " chatter" at me. Replacing the water lines cured the problem.