Which of the following statements is LEAST-Likely true?
A. A leaner air-fuel mixture causes a higher resistance to spark, requiring more voltage to jump the plug gap.
B. A poorly performing cylinder with a high firing line can indicate a lean air-fuel mixture.
C. A poorly performing cylinder with a low firing line can indicate low compression.
D. You should run the engine at 800-1,000 rpm for oscilloscope tests.
Answer: D
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