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It does sound like the torque converter is locked up fully or partially engaged causing the laboring issue here or slow acceleration.This puts strain on the transmission and engine when it is engaged like this when it shouldn't be and causes this fault here.I have had to replace the torque converter in the past before for this issue here and in some cases the control solenoid for it.Unfortunately this is what sounds like is occuring here and if diagnosed as a faulty torque converter it will need replaced.
I would have the transmission checked over as well when this is done to make sure no other components are at fault needing replaced to correct this or any other future issues that may occur.
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