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  • Hello Peter, welcome to tb.com

    I could be wrong but I don't think you need to upgrade ecm unless you are running 86-87 maf.

    Check out the sticky in the hot air section.

    Rick
    I have a 1985 GN. I Upgraded my ignition coil, ignition module, harness to an 86-87 year. Do I have to upgrade the ECU (ECM) to an 86-87?
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