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The PCM does not cause plug wires to arc. What is the gap on your plugs...... you never answered my comment about .50 If the gap is too large, the wires will arc.
the plug gap is .049 all eight right know, when i had the nkg plugs they where .044, and the ac delcos stock plug where at .050, i take my time when i do the gaps i know bad a gap can make a car run like crap.