the throttle plate cable that connects to the gas pedal? Something bouncing around a bit or loose? When the CC is engaged a 2nd cable operates the throttle plates via an actuator motor and if that cable has no slack — all is smooth. Pull the decorative Nissan cover on the top of the engine (if you have one still installed) and inspect the cable throttle pulleys and connections. In this picture you can see both cables center top of engine. [ http://www.jdmcalifornia.com/product/jdm-nissan-300zx-vg30dett-z32-twin-turbo-engine/ ]
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