New Post: Follow 1400+ ids = (400) Bad Request

I am trying to use Tweetinvi to track around 5000 twitter ids in one stream but when I try to more than 1400 ids I get the following error:

The remote server returned an error: (400) Bad Request.

I believe it has something to do with the length of the Uri that is being generated but I might be wrong.

I've been using using the FilteredStream and adding the users by their twitter ids.
stream = new FilteredStream();
stream.AddFollow(tuser.Id);

If you have any suggestions that would be great.