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I do not have the service manual for your year model, but from what I've read on the web it looks like you need to lift the truck, remove the front lower cover under the engine to access the sensor. It looks to be under the passenger side headlight and it looks like it twists in and out. One connector going to it.
Ah, I think I found it. On the intake manifold assembly. #7 on the diagram below. FYI it's also referred to as the Manifold Absolute Pressure Sensor. (MAP?)