I may be able to offer a few things... First, changing plugs and wires is not likely to help you much. If they are Iridium plugs, they are rated for over 100,000 miles. Unless you are getting misfire or rough running, the plugs should be fine. Also, how will you feel after you spend a pant load of money on plugs and wires and is doesn't help? Next, I would seriously look at things like the Oxygen sensor, MAF sensor and fuel pressure regulator.
GM vehicles use the Oxygen sensor as a feedback device for trimming the mixture. A sensor out of calibration will have a big effect on fuel consumption. Also note that GM's oxygen sensors are a weak point in their systems.
Mass Air flow sensor is another major controller of mixture. Cleaning it may help. This is one sensor that can go bad WITHOUT SETTING A CODE!!! There is no secondary reference to verify if it is out of range or out of calibration. It doesn't take a lot to have a major effect on fuel mileage.
Fuel pressure regulator. If this one is starting to leak, it will also cause a drop in mileage. Keep in mind that unless this is a "flex fuel" vehicle, the ethanol on the gas WILL attack the rubber in the diaphragm in the regulator. Regardless of what the Midwestern corn farmers tell you about it not causing problems.
You would be well advised to do (or hire done) some diagnostics BEFORE you start throwing parts at it.
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