| [ http://www.twinturbo.net/nissan/300zx/tech/autodiag/autodiag.html ] That might tell you if something is wrong. Also check your TPS and make sure it's at .45v. If it's not, adjust it to .45v (You can find the procedure by searching the tech section) or by typing: "site:twinturbo.net tps adjustment" in google. Sometimes the TPS be out of adjustment and the transmission will shift at odd times.
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