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<3.0L Engine>

WARNING: Wear rubber gloves while performing this test.

Disconnect, one at a time, each of the spark plug cables while the engine is idling to check whether the engine's running performance changes or not.
If the engine performance does not change, check the resistance of the spark plug cable, and check the spark plug itself.

Fig 1: Checking Spark Plug Cable - 3.0L Engine
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.