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Joined: Mon Nov 13th, 2017
Location: Pacific North West
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If those are the only 2 things you did. I think you would have to really screw up an oil change to have a noticeable change in power. But if you havent already check the oil level. Then, try putting the original o2 sensor on. If it runs as before the change, then it was a defective replacement.
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I know my crazy! Do you?
2007 Sport 4door 4x4 4.0L SOHC V6 Ranger