Chocolate Bundt Cake

1 (18.25 ounce) box chocolate cake mix
1 small box chocolate instant pudding
1/2 cup warm water
1/2 cup vegetable oil
8 ounces sour cream
4 eggs
1 (12 ounce) package semisweet chocolate chips

Combine all ingredients except chocolate chips and beat for 4 minutes. Fold in chocolate chips. Pour into a greased Bundt pan and bake at 350 degrees F for 50 to 60 minutes. Cool, then dust with confectioners' sugar.