Hi I know these saws inside out. The choke is also the fast idle cam. When you pull the choke on it steps up to fast idle. If you push the choke in without touching the throttle it stays on fast idle.

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On fast idle the chain has to turn because the clutch is engaged. As soon as you touch the throttle it kicks down to slow idle. The chain should stop and the engine should idle slowly. From what I read in your post is that as soon as you takle it off high idle it stalls. That is a simple setting of the throttle position screw. (The top adjusting screw that is all by itself.) The high speed and low speed are close together and are marked H and L.