Paul Abrahams in Stop Trying To Swing:
Play a constant stream of smooth eighth notes. At first it doesn’t matter which notes you play, as long as they are even. Don’t try to swing. Now leave some gaps between your phrases, but still hear and feel the 8s, even though you are not actually playing them. In other words this constant stream of 8s are always there “in the ether” whether you’re actually playing them or not.
Good read on learning to swing.