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Parts fail, what can you do but replace it.
Using a fuel line type wrench works better to loosen the nut, then you can use a regular wrench to remove.
Check the shifter cable clip at the transmission end.
Test blower, blower resistor, and/or switch.
On the left of this post is a search window, put emission systems or evap in the window and click GO. This will take you to an area that will give you more information.
Use the Estimator on top of this page for your zip code.
Check connections and wiring, possibly needs replaced and reset.
The BCM does not activate the A/C compressor is your first mistake. The PCM engages the relay to turn the compressor on. It really needs to have the circuits tested to be sure what it needs.
What is the short/long term fuel trim readings on the live data? Could be an issue with the air filter, fuel filter, fuel pump, exhaust leak, or vacuum leak. The computer could be recognizing the fuel enrichment is not being done properly when it has asked for it. Needs to be diagnosed further.
LMC Truck parts