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 - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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