Grease and flour bunt pan. Preheat oven to 350.

Melt margarine (let cool). Combine cake mix, margarine, oil and sugar. Beat each egg into cake mixture individually. Stir in sour cream.

Pour half of mixture into pan. Sprinkle 3/4 of the filling.

Pour remaining batter into pan. Sprinkle remaining filling on top.

Bake at 350 for 1 hour, 15 minutes (check at an hour).