* Consult your owner's manual: This is the best source for the precise location on your specific truck.
* Look at a wiring diagram: A wiring diagram for your year and engine will show the sensor's location and its wire routing. You can find these online through sites specializing in automotive repair information (some are subscription based).
* Visual inspection: Carefully examine the intake manifold. The sensor is usually a single-wire or two-wire sensor, fairly small and cylindrical, screwed into a port on the manifold. It's often near the thermostat housing but not always directly attached to it.
Remember to let the engine cool completely before attempting any inspection or work around the engine. The sensor and surrounding parts will be very hot.