Chain sometimes jumps. New parts
Even though the chain is new, you could have a stiff link.  I assume you cut the new chain to get the correct length.  If so I'd start there to make sure you didn't mess up the first remaining link.  Then I'd manually check each link for a stiff one.  If you find a stiff link, you can sometimes loosen it up by bending it a bit side to side.  That is at 90 degrees to plane of the pivot.