Beat together cake mix, pudding, eggs, water, oil, and sour cream. Pour 1/3 of the batter in a greased loaf pan. Mix sugar, nuts and cinnamon together in a separate bowl. Alternate layers of batter with layers of cinnamon mixture (3 each); ending with cinnamon mixture as top layer. Bake at 350 degrees for 40 - 55 minutes or until toothpick inserted in center comes out clean. ENJOY!!!