My auto blog only show 3-4 lines from source feed while feed do not excerpt the post, i am using WP feed plugin..
When you use autobloggers you must find feed sources that have full content, or find a way to turn the content from partial to full . My BlogSense has a partial to full rss built in. You also can use Yahoo Pipes if you can master the learning curve... it is not newbie friendly. Even my BlogSense has a small learning curve because what you are essentially doing, or trying to do, is access the original post and then determine what the full content is, and grab it, and make it your original description.