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Check the resistance of the EGR vacuum regulator (EVR) to make sure it's between 26 and 40 ohms. If not, replace the defective or incorrect EVR. Check the White/Red wire to the EVR for battery voltage with key on from the PCM power relay. Check the Violet wire from the EVR to pin 47 of the PCM for high resistance, open circuit, or short to ground. Check the amp draw of the EVR from the PCM connector looking for about 0.30-0.35A. If all tests pass then the PCM is to blame.
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