edub10068, I have had this happen to the carter W1 on my '36 Chevy pickup occasionally over the years. In each case a tiny obsruction found its way into the idle circuit. The solution that worked for me every time was to remove the idle air screw, squirt in a little carb cleaner and then blow compressed air through it.
That also worked on the Solex carb I had on a VW Bug decades ago.
