I had a Traction some years ago that would periodically misfire, then would clears itself for maybe a few hundred miles, then start misfiring again. It took me a long time to figure out trying numinous things which proved difficult, as I tryed and hoped it then started to misfire again. As a last resort I fitted an earth wire to the distributor and that Traction never missed a beat, covering many thousands miles thereafter.
Hope this helps to get your Traction running sweetly down Yonge Street once again.
Regards, Davy
David Selfridge