Hard Start
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Poor Fuel Economy
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Surges/Chuggles
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Rough, Unstable, or Incorrect Idle and Stalling
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Lack of Power, Sluggishness, or Sponginess
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Dieseling, Run-On
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Detonation/Spark Knock
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Backfire
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Hesitation, Sag, Stumble
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Restricted Exhaust System Check
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Cuts Out, Misses
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