When I had my TaoTao, Lancer, the fast idle, enricher, never really worked right.
It would start fast but the drop off within seconds, and stall. I had to baby the throttle until it warmed up a bit to keep it running.
I tried a manual choke (enricher) kit; that worked for a while, but then created a vacuum leak.
Do you have the old carb.? Perhaps swap the old enricher into the new carb.?.
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