Being a tech at a GM dealer I can say what you describe is likely a leaking EGR valve, vacuum leak, dirty injectors, not necessarily in that order. When looking for vacuum leaks don't overlook the brake booster as a potential source of un metered air. The EGR valve is a round thing about the size of a pop can with a wire connector on top and metal tubes going into the bottom, one from the rear exhaust manifold the other going to the intake on a 3.8. On all others, it will be an internal passage on the corner of the intake. It is fairly close to the brake booster.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let�s make one more addition to our series on hydraulics. I�ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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