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I went to the dealership for an oil change and a routine inspection. While I was there they pointed out that I had this firecracker noise coming from my intake when the throttle was lifted off of idle. I had never heard this sound before but I had cleared a P0315 CEL a couple times.
To me it seemed that the CEL and the misfires were related so I upgraded all four coils and haven't had a problem since.
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