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Q: Black exhaust pipe on 1997 Honda CR-V

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I always use denso Q20 spark plugs and for the first time two days ago my car was throttling like it is missing, when the plugs were taken out they were black and the air screw was black and the exhaust pipe also.
(1) Answer
It sounds like you may have a rich running or misfire problem. Do you have a Check Engine Light ever coming on? If so, this could give you a code that will really help you isolate why your Honda is running poorly. When was the last time that you had your valves adjusted?