If you can't get within specs throttle linkage may need adjustment and throttle bodies need cleaning. How to refurbish TPS here:
[ http://www.twinturbo.net/nissan/300zx/forums/technical/view/1102089/HOW-TO-Refurbish-your-TPS.html ]
Unfortunately pics do not come up in the last link from 2005
ZUL8TR
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