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The engine does not suck fuel through the injectors, the injectors squirt fuel under pressure, 60psi or higher. Your air intake is irrelevant as far as the injectors are concerned. If your hot air intake is too restrictive, then the air volume will be reduced, the Mass airflow sensor will detect less air flowing, and the injectors will squirt less fuel and you will just not go as fast as you otherwise would have gone. Further, the oxygen sensor tells the ecu what it sees, if the ecu detects a too rich a mixture from data from the oxygen sensor, then the mixture will be properly leaned.
That's the big picture. Actually the ecu goes from lean to rich, to lean to rich, ad infinitum.
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