Cinnamon Cake

Made for dessert the other night. Super duper moist. My only afterthought would be to add a yummy sauce on top. Like a cream cheese/powdered sugar type sauce.
1 box yellow cake mix
1 (5 oz) pkg instant vanilla pudding
3 T. flour
1 c. sour cream
1/4 c. oil
3/4 c water
4 eggs
1/2 c. sugar
4 tsp. cinnamon

HAND MIX THIS. Don't use an electric mixer!!!
Mix together cake mix, pudding and flour. Add sour cream, oil and water. Add eggs last, one at a time. Blend well. Mix sugar and cinnamon in small bowl and set aside. Spray bundt pan welll with cooking spray. Sprinkle 1/3 of cinnamon/sugar mix on bottom of pan. Next, pour 1/2 cake batter, spreading evenly over pan. Then sprinkle another 1/3 of the cinnamon/sugar mix and the last 1/2 of cake batter. Finish with latst 1/3 of cinnamon/sugar mix. Bake at 350 for 45-50 mins (I had to bake mine for more than an hour. But it came out perfect.)