Catera V6-3.0L VIN R (1997)
15. Remove the throttle body bolts.
16. Remove the throttle body from intake plenum.
17. Remove the crankcase vent tube adapter cover and screw.
18. Remove the crankcase vent tube adapter from the intake plenum.
19. Remove the intake plenum.
CAUTION: Mask off the ports to the intake manifold. Severe damage may result if foreign objects enter the engine.
20. Remove the intake plenum O-rings.