To release the intake manifold first loosen the clamp of the cable, take off the nut from the negative terminal of the battery; next unscrew the engine cover. Disconnect the coolant hose and those of the inlet and exhaust manifold then remove the air filter housing and the throttle body. Take out the accelerator and cruise control brackets from the intake manifold and then, go for release of the fuel system pressure. Then remove the engine oil fill tube and the transmission fluid fill tube bracket on the cylinder head. Pull the connectors off the fuel injectors, EGR valve, EVAP solenoid, MAP sensor, and throttle body sensors and be sure to remove the large wiring harness brackets from the intake manifold. Take out the fuel rails and injectors as a combined unit, knowing that doing so reduces the incidence of damage to the injectors. Remove the EGR valve and pipe assembly, remove any other electrical connectors or hoses that might exist and unscrew the intake manifold mounting bolts in a reverse sequence in that they can be easily unbolted. If the manifold is frozen, use prybar gently to loosen gasket to ensure that it does not distort the surfaces. One space away, check that standards of the mating surfaces of the cylinder heads, block, and manifold are clear from previous gaskets and free of gouge marks. Clean the area with safety solvent moistened cloth followed by vacuuming of the area if necessary. Thread the threads in the bolt holes with a tap and blow to free the holes of debris, where the tester has to wear some form of safety glasses. Place the new gaskets correctly into the intake manifold gap so that you hear them 'Click' before setting the manifold into place. Coat the threads of the bolts by using a medium-strength thread locking compound, place the bolts and tighten them in the sequence defined but to the required torque limit. Last but not the least, follow the previous steps and complete the installation process at last, check the coolant level and start the engine and check for any vacuum leak at the joints of the intake manifold.