Dan...
Sure, I stick to my guns. I had new gas and the venturi was plugged
from week to week.Small embuli of crude was contaminating the
orifice akin to a cardiac vessel, and resurfaced once the pressure
pulled it back into position.
I'm offering possible scenarios. I'm not a mechanic, though a doctor
sees things from his perspective and is willing to share experiences.
Hope you feel better.......

Les