Changed my trans about 4 months ago, recently in first gear it would struggle to get out of first once it catches it runs fine, was driving home and now In every gear it doesn’t want to shift until I stomp gas and let go and barley going anywhere

 

I recently changed all of my 02 sensors, cleared my codes and now truck barley wants to shift and when accelerating goes very slow with high rpm’s I’m only getting one code two times which is P0135

 

Might want to look at wiring harness that has O2 and transmission wiring for a pinch or rub through. Since you stated a recent trans swap. Also a failed MAF sensor will cause transmission and O2 issues. Good luck.
Brad

 

Looked at harness today took apart whole housing there was one wire split and some others were burnt, fixed wiring code went away, on my live code scanner it shows 0voltage still to that sensor and my truck is now shifting better but idling really bad, only code now is p0300

 

Unplug the MAF sensor and start it. If it runs and idles good that’s where I would start. Maybe clean the MAF sensor also may help.
Brad

 

I’ve descoverd one thing

When I’m driving I’m loosing a lot of power & acceleration, shifting is slow, rough idle, causing a missfire & if I’m correct the bank 1 sensor 1-Oxygen sensor tells the computer how much gas to put for the air mixture, and when it doesn’t receive voltage it dumps gas, shows I have voltage when I start the truck, once I accelerate or press the gas I loose voltage until I turn the truck off for a couple min then back on

sending fuel system into OL-Fault