The gasket must be replaced every time the exhaust manifold is detached and the engine must be cold in the process, to avoid damaging the valves through air leaks. Starting with, remove the negative battery terrestrial connection and flush the cooling system. After that, slightly loosen the vacuum hose linked to the power brake booster and, as a result, pull off the air intake duct assembly; finally, it is possible to have the throttle body and its coolant hoses detached. Remove electrical connectors from Throttle Position sensor and Idle Air Control valve; remove vacuum hose from fuel pressure regulator. Take out the bolts at the two fuel injector harness brackets and then detach the electrical connectors from the fuel injectors and put the fuel injector harness to the side. Disconnect the fuel lines from the fuel rail along with the sealing washers of the banjo bolts of return and fuel supply line. Move on to the removal of the fuel rail assembly, pulling of the accelerator cable from the throttle body in addition to the separation of the EVAP canister purge valve hose and the EVAP hose sticking on the throttle body. Disconnect the alternator mounting brackets, and the two bolts of the ignition coil bracket to the intake manifold. As you work at the base of the car, take out the intake manifold support bracket nut and the coolant pipe bracket bolt and then set aside the manifold bracket and the coolant pipe from the manifold. Last of all, take off the intake manifold bolt and seven nuts to get the intake manifold out of the way. For installation, stuff clean, lint-free rags into the intake ports and scrape off all remnants of old gasket and sealant; clean mating surfaces with lacquer thinner or acetone. Position the intake manifold on over the cylinder head and secure it with a bolt and nut tightening it to hold the manifold in place but do not over tighten. After that, tighten the mounting bolt to the nuts until there will be a required torque, trying to perform the operation starting from the center of the nut and moving towards the ends in three or four turns. We also come across the fact, that the rest of the installation procedure is quite similar to the removal procedure performed in reverse order. Add oil to the radiator and lead the car for some time, look for any sign of leakage, and adjust the idle speed as well as the throttle linkage.