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The brains of the operation are inside the Power Control Module (CM-12A650-463V), or PCM. Lots of people refer to this item in an EFI application as the ECM or ECU, but Ford calls it a PCM. The PCM for this kit is programmed specially for running a 4.6L or 5.4L engine in a non-stock vehicle; you can't use a stock PCM and vice versa without getting a "no-start" code. This PCM won't work with a Mustang-style return-less fuel system, either.