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One other thought: You said it stumbles at idle for a while, and then it goes away. That could be another indicator that your fueling is off. The first couple of seconds at idle the car is in open loop: the o2 sensors won't correct the A/F ratio until they have warmed up. Hence you are running off some standard fuel maps. Once the car is idleing in closed loop, the o2 sensors correct the mixture.
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