18. Clean up the EGR valve.

The EGR valve looks like a small soda can and sits atop the intake just to the driver side of the alternator. Just remove the two screws holding it in, disconnect the electrical wires to it, rotate the valve to expose the mounting flanges, install a wire loop to connect the two flanges over the top of the module (leaving a loop that sits a few inches above the valve), and use the alternator as a lever in conjunction with a pry bar or long screwdriver to pop the valve up and out. Clean up the (hopefully dry) gunk that you find, carefully inspect the two seals for damage, ensure that the valve moves as its supposed to, and reinstall it. The result is a smoother running truck.