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Check your vehicles o2 sensor. These sensors only work after they have reached full operating temperature. Up until then they operate in open loop mode. To test, try unplugging the sensor and driving around. If the car doesn't spit and stutter after time has passed, you've found your problem. Remember, when you unplug you o2 sensor, the vehicle check engine light should turn on.

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Q: What would cause your 87 Jeep YJ to start sputtering while in motion after 10 minutes?
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