Turn the boost down and drive it gently till its fixed or you could be looking at a new engine.
Take the car to a tuner and get him to have a look at the Mines ecu to see if its tunable (most are not).
If not buy a stock R34 auto ecu and get a Nistune chip put in it. Get some Neo friendly injectors 550 or better.
Look in the tank and see if you have a new fuel pump. If not, buy one and install it if you can or if not add it to the injectors.
You will need a genuine Z32 afm (and plug) if you haven't already got one.
Ask around and find a good tuner (in another town if necessary) and hand him all the bits (or install the bits and tow the car to the tuner) and get it tuned (point out, although he should notice, that the FPR needs adjusting). If nothing has been damaged it should go well.
In the meantime baby the car - no mega boosting, no skids etc.