Find the symptom in the left column and perform the test/inspection procedure in the right column

Hard Start

Surges/Chuggles

Lack of Power, Sluggishness, or Sponginess

Detonation/Spark Knock

Hesitation, Sag, Stumble

Cuts Out, Misses

Poor Fuel Economy

Rough, Unstable, or Incorrect Idle and Stalling

Dieseling, Run-On

Backfire

Hard Start

Surges/Chuggles

Lack of Power, Sluggishness, or Sponginess

Hesitation, Sag, Stumble

Cuts Out, Misses

Poor Fuel Economy

Rough, Unstable, or Incorrect Idle and Stalling

Backfire

Inspect the crankshaft position (CKP) sensor for damage and proper installation.