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just cause the throttle plate is closed doesn't mean air doesn't get in the combustion chamber..
I would think under engine braking when your RPM's are above normal idle you are consuming more air/fuel due to rpm being higher.. this would require more fuel or else you may cause detonation. Seems that cutting fuel with higher rpms while engine braking could cause engine failure.
Am I completely off base here?
just curious.. what circumstances cause you to ask this question sixbanger?
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