Odd stumbling, lack of power, and low fuel mileage problem

[dogboy]

if your refering to the 02 sensors, it triggers a CEL because there is an o2 sensor on each side of the "Y" on the exhaust. one o2 sensor reads the air/ fuel ratio for bank 1 while the other reads the air/fuel ratio for bank 2 of the engine. if you have the wires crossed and plugged into the wrong connectors it will confuse your engines computer. For example if your wires are crossed and your o2 sensor detects a rich condition in bank 1, it will try to solve the problem by leaning out the fuel to bank 2 or vice versa. If it detects a lean condition in bank 2 it will try to fix this problem by dumping more fuel into bank 1. now can you see why this is the exact (and probably only) cause of the Intermittent CEL codes for
too rich bank 1 and 2, ...and
too lean bank 1 and 2

Oh, ok, I understand what you meant now!!
I thought you meant reversing the connector as in connecting it upside down. And I wasn't sure how that was possible becuase the connectors can only go together one way, haha.

I'll definitely have to check the wires now. I am going to replace the battery terminals today because mine are kinda corroded, but I don't think that is related to the problem.

 

[fireguy12117]

makes complete sense now, mazdamama. might even be something im going to double check since ive still had poor drivability post engine swap.

 

[mazdamama]

let me know if this fixes anything

 

[dogboy]

Yes, it did!!!

I found a wiring diagram, and sure enough, the plugs were backwards... It wasn't until right after autoshop that I realized, when we did the tranny swap we did not disconnect the sensors, we just removed them from the Y-pipe. But what I didn't realize is when we put the tranny back in, we criss crossed the wires then.

The truck runs like a champ now!

Thank you so much mazdamama, and fireguy12117, for helping me!! I gave both of you a "reputation" point.