Preheat oven to 350°F (175°C). Grease a cake pan.

In a large bowl, combine the yellow cake mix, eggs, oil, milk, Kahlua (3 oz), and instant vanilla pudding.

Mix with an electric mixer until smooth.

Pour the batter into the prepared cake pan.

Bake for 45 to 50 minutes, or until a wooden skewer inserted into the center comes out clean.

While the cake is baking, prepare the Kahlua glaze.

In a saucepan, combine the remaining Kahlua (1 cup), sugar, and margarine.

Bring to a boil over medium heat, stirring until the sugar dissolves.

Remove the cake from the oven and poke holes all over the top with a fork or toothpick.

Pour the hot Kahlua glaze evenly over the warm cake.

Let the cake cool completely before serving.