i just got a 06 1 ton dually 4x4. 5.9 with 180000. auto tranny. i was pulling about 12000 pounds. it was goin awesome, then it just lost alot of power. felt like the brakes were partly on. i pulled over brakes were fine. know it feels like the tranny is slipping. it takes forever to get goin. i pulled the codes and this it the one that came up. p1753 has anyone had a problem like this?

 

P1753-transmission Throttle Valve Mechanical Performance

sorry couldn't help more