2009 Hino 145 lack of power on acceleration from stop

2009 Hino 145

New Recruit
Owner/Operator
I've been having this issue for a month now and I changed the throttle valve thinking it would repair the issue. I keep reading it could be the brake switch but most of the comments say that only applys for air brakes. I've tried to connect through obd2 but no codes or anything.
Please guide me with this evil issue that's driving me nuts!
 
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