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Make sure the flow going to the MAFS is good. I had very similar problems (Also RS Enthalpy Tune, 550cc injectors, and z32 MAFS)when the adapter between my MAFS and air filter cracked. If the flow is not uniform through the MAFS then it could send the ECU faulty readings. I chased that issue for longer than I would like to admit. Martin is very helpful.
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