Use WD 40 from a trigger gun, not a aerosol can.
The propellant could go POOF
Usually a surging is issue is a clogged main jet.
Type that engine model # into parts tree.com and look at the carb in the diagram, it should show you where the jet is to take it out and clean it.
This was the issue - eventually figured it out!
I went as far as replacing the carb with a knock-off from Amazon, which barely ran at all, then I found a YouTube video showing a different jet. I assumed the jet I needed to clean was visible with the bowl removed, however I found the video below and cleaned the jet under the black plastic cap with a stand of wire - felt something dislodge - now it runs like a champ!
Thanks for the advice.
-Eric