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the det could have blown the plugs out if it was bad enough, it sounds like classic preignition, did they install a jack to hook up a knock amp? this
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the det could have blown the plugs out if it was bad enough, it sounds like classic preignition, did they install a jack to hook up a knock amp? this is a must when tuning FI, as the knock sensors will let you hear knock long before you could without headphones.
You could check the wiring bythe ecu for a splice on the knock wires
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