To remove the intake manifold from a 2002 GMC Envoy with a 4.2L engine, first disconnect the negative battery cable and drain the cooling system. Next, remove any air intake components, throttle body, and vacuum lines attached to the manifold. Then, unbolt the intake manifold from the engine block, carefully lifting it off while ensuring no gaskets or debris remain in the ports. Finally, inspect the manifold and gasket for damage before installation.
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