They do their job exactly as it says on the box. My car has no misfires or idles. I would even say that it works better at idle than with stock coils. With the old coils, the idle was not nearly as smooth as with these coils. Especially with the car in gear while stationary. The car accelerates without the hesitation and judder that I experienced when the old coils started to fail. Highly recommended. Update: 07/30/2018. The coils broke after a year and a half. Replaced them with Bosch blocks.
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