Originally Posted by JimmyL

Welcome to the site.
Welcome to the world of white '85 wagons.
Welcome to the search function. You should spend your first week there. Lots of info.
Your lack of turning off is a vacuum leak. Probably the most common malady of these old cars.
So, search, search, search......

Oh, and btw, if your 300TD isn't a wagon, I'll be back........