1 yellow cake mix
1 pkg. vanilla instant pudding
1 c. sour cream
1 sm. can (5 1/2 oz.) Hershey chocolate syrup
1/2 c. chocolate chips
3/4 c. oil
4 eggs
1 tsp. vanilla

Mix together all but chocolate syrup and chocolate chips. Put 1/2 batter in a greased bundt pan. Take a cup or so of the remaining batter and mix with chocolate syrup and chocolate chips, then put in pan. Put remaining batter on top. Take knife and swirl through cake. Bake at 350 degrees for 45 to 60 minutes. Let cool in pan 10 minutes, then remove from pan.