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You may want to check the resistance on that plug wire to see if it's damaged internally. Try moving the spark plugs around as well to see if the problem stays in that cylinder or goes with the plug. The plug might be damaged and not sparking strong enough. It sounds like you were running on 7 cylinders when it started jerking.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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