is the tune done on the ecu or just programming the neo? like did you send the ecu to enthalpy, jwt or something because the neo is only good for fine tuning a reflash not very efficient on its own especially with 800cc' and the z32 maf. check your throttle cable as well could be loose? i know one time when i was driving one of the ic piping came off and the car ran like shit till i got home (2 blocks away), now thats a big leak!
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