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While knowing previous repair and service history is important, it's more important to know the current parameter indicator data (PID) - those will point us to the cause of the no-throttle-response issue.
Mainly, we need PID on accelerator/throttle position, as the sensors that generate those data are usually associated with the no-throttle symptom.
These are all computerized control systems and, to work on them, two things are required: technical knowledge and tools that can communicate with the onboard electronic modules.
I can provide the technical guidance, but whoever works on the truck needs to have access to a WDS or equivalent scan tool. Otherwise, it's all guessing, which leads to the unnecessary (and very expensive) replacement of parts.