[bwood]

Here is a copy and paste from another forum:

Here are the steps that you need to do to remove the intake manifold

Disconnect the accelerator control cable and the cruise control cable, if equipped, from the throttle shaft. Refer to Accelerator Controls Cable Replacement in Engine Controls.
Position the cables to the side.
Remove the engine sight shield mounting bracket and the bolts.

Remove the air cleaner duct.

Remove the inlet coolant hose from the throttle body.

Remove the vapor vent tube hose from the throttle body.
Remove the exhaust gas recirculation (EGR) pipe bracket. Refer to Exhaust Gas Recirculation (EGR) Pipe Replacement in Engine Controls-4.8L, 5.3L, 6.0L.

Open the large electrical harness retainer, then remove one M6 nut in order to separate the engine harness from the intake manifold.

Disconnect the following electrical connectors:
Eight fuel injector connectors
Idle air control (IAC) motor
Throttle position (TP) sensor
Evaporative emission (EVAP) canister purge solenoid
Manifold absolute pressure (MAP) sensor
Set the electrical harness aside.
Disconnect the purge solenoid vent tube from the solenoid by squeezing the retainer, then release the tube from the solenoid. Refer to Evaporative Emission (EVAP) Canister Purge Solenoid Valve Replacement in Engine Controls - 4.8L, 5.3L, 6.0L.
Disconnect the fuel pipes from the fuel rail. Refer to Quick Connect Fitting(s) Service (Metal Collar) in Engine Controls - 4.8L, 5.3L, 6.0L.

Remove the vacuum brake booster hose, if equipped.

Remove the positive crankcase ventilation (PCV) valve (2) and hose (1).
Remove the intake manifold from the engine. Refer to Intake Manifold Removal .
Clean and inspect the intake manifold and all sealing surfaces. Refer to Intake Manifold Cleaning and Inspection .