2008 Hino 338 accelerator cuts out randomly.

wheelcheck

Active Expediter
I have a 2008 Hino 338 where the accelerator just cuts out randomly. It idles fine but the throttle just does not respond. It's a garbage truck so it is also wired for high idle when the hydraulics are in use and when this issue occurs, it also prevents the high idle from working. I replaced both the electronic brake switch at the pedal and at the pneumatic switch at the rear of the chassis. Any ideas?
 
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