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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. http://www.automotivehelper.com/topic404867.htm Also check your timing, air filter and plugs.

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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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