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I changed my plugs out for the first time after 126k miles and now I have a stutter when when in idle or slight acceleration or coasting. No problems before hand. I used NGK iridium plugs from advance. No codes for the first two weeks then finally got a cylinder 8 misfire. I changed the ignition coil on cyl8, it cleared the code but not the stutter. Does anyone know what the spec is for a good coil?