P0302 Cylinder Misfire

SonicVQ

The "MEC107" is not the part number, it is more like a production number.

You need to find out the ECU ID of your existing ECU. It will be something like "6GC2A"

This can be done with an cheap ELM327 OBD scanner and an app like:
• OBD Fusion (in diagnostic reports, under calibration ID)
• NDS III (Android Only and bluetooth OBD scanner only)
• Torque Pro (Android Only under Adapter settings)

The actual part number for your ECU is 23703 + ECU ID, for example: 23703-1UX0A
IF your ECU ID is 1UX0A.

As far as I know, the 370 and G37 use the same hardware for the ECU, but have different programming in the ROM and in the EEPROM that is not part of the SH7059 processor, but a separate 8 pin IC.

You will need to copy the ECU ROMs programming and write it to the new ECU.
I don't think your MPPS cable will work on a Nissan / Hitachi / Renesas ECU.

Also, you will need to copy or move the 8 pin EEPROM that holds the key IDs, VIN and other stuff.

I think your best option is to contact "ByThaBay" (Nissan 370Z Forum - View Profile: ByThaBay).

I think he can provide a pre-programmed ECU that you can just swap in.