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Oxygen sensors generally do not operate when "cold". Engine is in open loop mode while warming up. In additionl, oxygen sensors generally do not cause this kind of problem. I've read elsewhere that there is a sensor in the distributor that can get dirty and cause the symptoms you're experiencing. Sorry, don't have any links handy.

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Q: 95 Villager runs terrible and sputters-backfires when cold is there in fact a second oxygen sensor or what else could cause these symptoms?
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