I installed a used 82k mile long block GEM motor. The only parts I switched over from the Callaway engine are: flywheel, upper manifold and plenum, coil pack, MAF and fuel rail. I realise the system is designed for use with all of the intake parts but it seemed promising that my code count deminished with the remedies applied so far. Are the heads on the Callaway so different? Could I swap the ECU with a standard GEMS unit to resolve?
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