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The stumbling on start up with white smoke is the classic symptom of leaky injectors. The engine doesn't operate closed loop until the sensors are warmed up. So whatever is happening on cold start has nothing to do with the O2 sensors.
Pull the plugs before your next cold start up. If you see wet, black plugs, it's an injector problem.
Your vehicle may have any number of problems but bad injectors is one of them.
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