The simple answer is that because fuel cut is pre-programmed into the ECU, there is no method of disabling it. There are no modifications that can do so, aside from an ECU upgrade that eliminates fuel cut. Upgraded fuel pumps, injectors, and fuel pressure regulators do nothing to avoid or eliminate fuel cut. NOTHING.
That being said, there are some methods (some cheap, some not) of postponing fuel cut. All the methods work on one principle: fooling the ECU into thinking there is less air entering the engine than, in fact, there is. This can be done by adding unmetered air, or by changing the sensor inputs used by the ECU to determine air mass. Of course, these methods usually mean the engines run leaner than stock. Again, read Chapter 7 of the ECU primer for details.
Budget Methods include:
An ECU upgrade to ECMLINK or AEM is the only way to really eliminate fuel cut
WHAT SHOULD I NOT DO TO PREVENT FUEL CUT?
Do not decrease air counts without adding more fuel per air count. This will cause you to just run lean all the time and cause exactly what fuel cut tries to prevent. So....
DO NOT PUT IN A FUEL CUT DEFENDER.
DO NOT RUN A 2G MAF ON A 1G WITHOUT A WAY TO BALANCE IT OUT.
DO NOT JUST LEAN OUT YOUR AFC TO UNSAFE AFRs.
DO NOT TURN DOWN YOUR GM MAFT TO UNSAFE AFRs.
DO NOT TRY AND PUT IN LARGER INJECTORS WITHOUT FUEL MANAGEMENT.
DO NOT TRY TO UP THE FUEL PRESSURE WITHOUT FUEL MANAGEMENT.
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