automatic choke

When I start my 1.8 auto the choke wont kick  in and I have to acclerate to keep it running it has a peirburg auto choke carb which is running very rich by the smell of it I dont no much about carbs as iv always had injection can anyone help me with this problem thanks

Have a look here: http://vwgolfmk1.org.uk/forum/index.php?page=topicview&id=big-block-carb-engines_2%2Fhow-to-repair-your_2