what does your boost guage say at idle ?
i you are bogging a little from a start it might be due to a vacuum leak/boost leak or a faulty maf.
pick up some electrical contact cleaner or Sensorkleen and go nuts on the inside of the maf. dont use break cleaner because that stuff will leave microscopic crystals and fuck up the Maf sensor.
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1992 240sx (RB20. 362whp@16psi)
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