Well the logic is bogus, but that doesn’t mean they did anything wrong. If they had to replace the plugs, then you could have had a misfire due to a bad plug. Every time a plug misfires, it can do damage to the coil. The coil has to spark somewhere and if its not through the plug, then it arcs internally. These internal arcs eventually take their toll on the coil and it will fail.
keith
2
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