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The O2 sensor is brand new. I know the system runs in a closed loop until it gets warm, then it runs on an open loop. So I would think that since it runs pretty well until it warms up, that would suggest that something, maybe a sensor, is sending a bad message or maybe no message at all as soon as the loop opens. That is why I starting replacing sensors, but nothing has worked yet. Although when I replaced the knock sensor it run a whole lot better during that cold time.
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