Have them attach a fuel pressure gauge to the fuel rail and watch fuel pressure under acceleration.
Also, have them check for a plugged catalytic converter. Easy to do by watching the MAF sensor data.
This sounds just like a lack of airflow or a severe lean condition.
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes.
SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory!
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