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Timing SHOULD be 15 Deg btdc.
What you want is ignition base timing.
You're checking timing with ecu in control
Simple,
Warm engine up,turn motor off, disconnect TPS ( throttle position sensor) with engine off, start up engine, check timing with gun, play with the CAS ( crank angle sensor) set to 15 deg, secure CAS, snap throttle ( quick rev), let idle .. adjust idle if needed via IAA on intake manifold.
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