Fuel cut is basically the ecu telling you that there is too much air coming in for the fuel to support it. This is why you get an safc, to lean it out and fool the ecu into saying there is less fuel needed for the air coming in (metered air).
If you get 550s the D/C rises therefore the fuel cut limit rises too. If you get a bigger fuel pump that raises pressure which make the Injectors work less i think.
Correct me if Im wrong.
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