Pierce had the carburetor for a while now. Everything seemed normal on the flow bench. After a lot of back and forth, they finally did find something.
"In my 41 years of servicing Webers, I've never seen this problem."
Apparently there were 2 missing passage plugs which prevented a vacuum being drawn in the idle circuit. When he "back fed" the idle circuit, the problem became evident.
I remember I was consistently fouling a plug as well so maybe this has been an issue for a long time.
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