The Terraza is powered by a coarse 3.9-liter, V6 engine. The heavy second-row seats can be folded and removed unless you choose the optional rear-seat side air bags, while the third-row seat folds flat on the floor when not in use. It drives much like the Chevrolet Uplander we tested, with a stiff ride and noisy interior. Handling is clumsy. The interior trim is insubstantial. This family of GM minivans is outdated and not competitive in its class. Reliability has been much worse than average. IIHS side-crash-test results are poor without the optional side air bags and acceptable with them.