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I had the same problem. I will start with checking and or replacing the O2 sensor. If the sensor goes bad it will automatically make the carb run rich to protect the engine. Also check your timing, air filter and plugs.

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โˆ™ 2011-10-20 17:03:29
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Q: You recently took your truckMazda b2000 in for a emissions test and you came out failing They said that the engine c o mixture was running to rich where do you adjust something like that on your carb?
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