Rolled out for the 1999 model year alongside the Silverado, the first-generation GMC Sierra is a pretty capable pickup for that particular era. The Vortec 6000, which was offered on the heavy- and ...

In their later years, Vortec engines have fallen victim to some downsides, like Active Fuel Management, an aggressive thirst for oil, and engine knocking. But back when they were brand-new, these ...