GM dealers business practices have lost GM another customer and sent him overseas for a quality dependable product. I've owned it since new. Last problem that set an error code was fixed by cleaning the EGR and replaceing the Idle control solinoid. Other then starting and Idle problem the engine runs with plenty of power, and milage has not changed. Starting requires that you depress the accelerator and the rough idle does produce black smoke and a bad smell.
Idle speed seems about right except for the roughness.
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