Changed plugs. Long term fuel trim on both banks is going to -25 at idle. Both banks go normal when rpm's increase.

My OBD is showing catalyst = not passed, O2 sensor = not passed, O2 sensor heater = not passed.

Any suggestions? Much appreciated!

Where is MAF in this truck? I'd like to clean/test it.

I found the 3 MAP's and replaced one of them that tested bad.

 

You don't have a MAF. You do have something that looks like a MAF, but it's an IAT sensor.

 

P0172 is bank 1 rich condition. The MAP sensors are not able to tell bank 1 from bank 2. The furthest downstream is in the center of the intake manifold.

Can you check the duty cycle in injectors 1,2,3?

 

So that's just a sensor checking the air temperature?

 

Yes.