distributor housing

on a 1999 chev. half ton does any one know where to find the vent on the distributor housing , guess it has to be cleaned out so GM says. Need help

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.