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Q: cylinder #4 misfires, and the code says low coolant as well as O2 sensor on 2004 Chevrolet Trailblazer

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I have MULTIPLE DRIVEABILITY SYMPTOMS of CHUGGLE, ROUGH IDLE AND LIGHT OR INTERMITTENT MISFIRE. It feels like the engine is stalling, but it doesn't. also when i ascend up a hill it feels rougher than when i am going down.
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