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Q: Drop in engine power on 2000 Nissan Frontier

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Hello. I have a 2000 Frontier, six cylinder. Last month the engine power dropped dramatically after the engine warmed up__to the point that it is barely driveable. Again when the engine is cold it drives perfectly___only after warm up do I have the problem. The check engine light does not come on. Any thoughts?
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This sounds to me like an emissions problem like the o2 sensor or cat. convertors. Are you getting a code?
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