Yes you will need to replace the gaskets in the upper intake manifold.
Here are your instructions and pics
3.Disconnect the accelerator cable, the cruise control cable and the throttle return spring
4.Remove the bolts and position the bracket and cables aside
5.Disconnect the throttle position (TP) sensor and the idle air control (IAC) valve electrical connectors.
6.Disconnect the heated throttle body coolant tubes
7.Disconnect the positive crankcase ventilation (PCV) hose.
8.Disconnect the vacuum supply hose
9.Disconnect the brake booster and evaporative emissions (EVAP) vacuum hoses
4.Install the EGR valve.
5.Connect the brake booster and PCV vacuum hoses
6.Connect the vacuum supply hose
7.Connect the PCV valve hose
8.Connect the TP and IAC valve electrical connectors.
9.Connect the heated throttle body coolant tubes
10.Position the bracket and cables and install the bolts
11.Connect the throttle return spring, accelerator cable and the cruise control cable
12.Install the pin-type retainers and the accelerator cable splash shield
Remove the bolts and the ignition coils