could be a vacuum leak....
did you wire in the z32 maf correctly, post up how u wired it in (there are lots of incorrect z32 maf pinouts on the internet)
do you have an safc2? if you do, change back your safc2 from 2 in 6 out to 6 in 6 out since your ecu is now tuned for the maf.
gl,
Dave =]
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 RB25 280z GT30/76R 441hp/381tq 11.9@125
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