Sierra 3500 4WD V8-6.0L (2008)
25. Remove the positive crankcase ventilation (PCV) hose from the intake manifold fitting.
26. Position the hose out of the way.
27. Loosen the intake manifold bolts (512).
Important: The aid of an assistant may be helpful in holding the engine harness up out of the way so the upper intake manifold cover
does not get caught against the engine harness.
28. Remove the intake manifold (500).
29. Cover the cylinder head passages in order to prevent dirt or debris from entering the passages.