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[new echo owner]

On some models, the 3.4L is equipped with EGR, is yours one of them? All 3.4L are equipped with knock sensors, so under most operating situation there shouldn't be any Pre-ignition concern. Do you know what you fuel trim is running at? A lean fuel trim is more prone to pre-ignition.

By the way, the numbers on the plug wire is the cylinder numbers. #1, #3, #5 cylinders on the right bank and #2, #4, #6 on the left bank.

N.E.O.