To remove the intake manifold, first relieve the fuel pressure and disconnect the negative battery cable, ensuring the Theftlock audio system's lockout feature is off if applicable. Next, remove the TBI cover and air cleaner assembly, then raise the front of the vehicle and support it securely on jackstands while draining the coolant. Label and disconnect any wires and vacuum hoses that may interfere with the manifold removal, followed by removing the throttle and TV cables along with their brackets. Proceed to take off the TBI assembly and fuel lines, and if equipped, remove the power steering pump, tying it aside in an upright position. Remove the heater hose, then pry the engine forward for additional intake manifold clearance by first removing the torque strut-to-engine bracket nut and bolt, using a pry bar to move the engine forward, and supporting the torque strut with a bolt through the slave hole into the bracket. Afterward, remove the mounting fasteners from the intake manifold, ensuring to tighten the bolts gradually in the specified order for models through 1990, while using the same tightening sequence for 1991 and later models. Finally, separate the intake manifold and gasket from the engine, scraping off any gasket material from the mating surfaces. For installation, reverse the removal steps, using a new gasket and tightening the nuts and bolts to the specified torque in the correct sequence. Add coolant, run the engine, and check for leaks and proper operation.