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will do the trick for rotors. They often have runout right from the factory, or the hub can be a little bit off. Indexing them on the hub may help, but this needs to be checked with a runout/dial gauge. Some Z's can also be very particular about the wheel balance. You may need to have them strobe balanced on the car (if you can find someone who still knows how to do this). I had this issue on a 93 2+2 many years ago, and I needed to have the tires trued to eliminate high spots and then strobe balanced. This was the only way to get rid of the harmonic vibrations (ones occurring only between certain speeds). However, if it occurs when braking (and not within those same speeds) its likely a rotor problem or loose suspension, as others have mentioned.
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10:03:00 04/11/18
