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Hey there i just finished swapping a new b16a2 in my em1 it had a b16a3 in it and i now have the new engine all new fluids plugs wires distributor alternator and its still not starting up any ideas?

Is it possible? I'm doing a swap to go back to the a2 after there was an a3 in my em1 will I need a new wiring harness and ecu or just the harness?