I just noticed something on the car i noticed on a lot of other cars as well. Are you putting any pressure on the steering wheel when the rpm falls? It's a common incident in all cars with power steering. If you touch the steering wheel and put some torque on it, the power steering pump engages and applies fluid pressure. This increases drag and drops rpm down a bit for a couple of seconds before the ecu compensates by increasing the throttle opening and regaining normal idle speed.
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2009 370z Sport Touring/Nismo shift Knob/Z1 motorsports 34 row oil cooler
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