Pecan Coffee Cake

1 package (18.25 oz) yellow cake mix
1 package (3.4 oz) instant vanilla pudding mix (or 1 package yellow cake mix with pudding)
4 eggs
1 cup (8 oz) sour cream
1/3 cup vegetable oil
2 teaspoons vanilla extract
2/3 cups chopped pecans
1/3 cup sugar
2 teaspoons cinnamon
½ cup powdered sugar
2 tablespoons orange juice

In a mixing bowl, combine the first six ingredients. Beat on medium speed for two minutes. Pour into a greased 9x13" pan. Combine pecans, sugar and cinnamon; sprinkle over batter. Cut through with a knife to swirl. Bake at 350° for 35 minutes or until a toothpick inserted comes out clean. In a small bowl, combine powdered sugar and orange juice until smooth. Drizzle over warm cake.