Preheat oven to 350 degrees F (175 degrees C). Grease and flour a 10 inch Bundt pan.
In a large bowl, combine cake mix, pudding mix, sour cream, eggs, oil and coffee liqueur. Beat until ingredients are well blended. Fold in chocolate chips. Batter will be thick. Spoon into prepared pan.
Bake in preheated oven for 1 hour, or until cake springs back when lightly tapped. Cool 10 minutes in pan, then turn out and cool completely on wire rack.