Swap to a 3800 series 2 aluminum upper intake manifold
Replacing your stock plastic part with a 3800 series 2 aluminum upper intake manifold is basically the best favor you can do for your car's longevity. If you own a Buick, Pontiac, or Oldsmobile from the late 90s or early 2000s, you likely already know that the GM 3800 Series II engine is a total legend. It's often called the "cockroach of engines" because it just refuses to die. However, even the toughest engines have an Achilles' heel, and for the Series II, that weakness is the factory composite (plastic) intake manifold. ...