"A stuck piston will will run very rough from beginning the slowly clean up as the choke opens. [/quote]" That's exactly what happens if I set the choke butterfly just up to the housing, like instructions/video. If I leave a 1/16 gap with the butterfly and housing it starts..runs at a high idle and stalls when butterfly opens completely in less than 30 seconds. As the engine starts to clean up at cold start, the butterfly opens at the same time and a few seconds after the engine is "cleaned" up the car will stall (in park) because of loss of rpm. If I juice it when running, it will run but if letting off the throttle, it will stall until reasonably warmed up. This is a new carb..bought last Sept and had this issue since day 1.

Thanks again to all for the input