Mix cake mix, oil, eggs, sour cream, and pudding mix with an electric mixer for 5 minutes. It will be a very thick mixture.

In small bowl, combine sugar, cinnamon, and chopped nuts.

In a greased and floured Bundt pan, layer from bottom to top 1/2 of filling, then 1/2 of batter. Repeat.

Place cake in COLD oven. Set at 350 degrees and bake for 1 hour.