Sounds alot like an EGR valve problem to me, but since you don't seem to have one, we could probably rule that out. When you start the engine cold, do you by chance leave the ignition on for a second before starting, say to prime an electric pump? The reason I ask is because that will cause an electric choke to open too soon. Then, when you switch it off, and restart, the choke automatically closes . Just a thought. In any case, you need a helper to watch the choke while the problem is occurring, and see what's going on.
Take care,
-Chris
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