| - Pull ECU code by turning screw on ECU while ignition is on, search for "300zx pulling ecu codes" - If code 34, it's possible you mixed up the detonation sensor plugin with another plugin that also fits (can't remember..VTC or O2 sensor or something) - If no codes, look for boost leaks - Use the OEM spark plugs and NOT some you can get at your local parts store. Gap them correctly. This is very important. - TPS/CAS, clean the connectors and check them for proper adjustments - Since it's a 90, read up on the bottom of this page: [ http://twinturbo.net/nissan/300zx/FAQ/FAQpages/hesitate2.html ] More info would be easier to help you. How many miles, when does hesitation occur, etc.
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