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What's the most likely cause for a PO402 code? on 2000 Ford Explorer

Truck runs and shifts fine when cold, as motor warms it lacks power, surges, and has shift problems but idle is okay.

SOMETHING IN THE EGR SYSTEM IS MALFUNCTIONING OR POSS DPFE VALVE. SEEK PROPER DIAG AND EST AS THERE IS SEVERAL THINGS IT COULD BE, INCLUDING PLUGGED EXHAUST SYSTEM
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