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