I've always thought this was by design; that the revs do that after you depress the clutch for 2 reasons. It was like this in the 350 as well. It allows for smoother shifts. By holding or slightly increasing the revs before it begins to drop, it gives you more lee way to meet the revs when you pop in the next gear and left off the clutch. Secondly, have you ever driven a car, say in 1st gear and rev'd it up to like 5000 rmp's then let off the throttle? It jerks and shudders! And to avoid that, you would normally have to depress the clutch before letting off the throttle. But not in the Z, it is very smooth. Just let off the throttle and watch the revs go up and hold for a second to keep the car from jerking.
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