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I just recently replaced the coils and spark plugs with a set of Bosch coils and NGK plugs. Prior to the replacement, I had a bit of idle issue. While parked at a light (in DRIVE), I would notice the idle surge from 600-800 RPM. I can also feel like someone literally bumping into the back of the car, almost like jerkiness feeling. After the install, both issues were gone.
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