How do you install a thermostat in 5.0 liter fuel injected 1987 Pontiac trans am?

Follow the upper radiator hose back to the engine. There will be a outlet mount there that the hose connects too. There are two bolts on each side you must remove, it may also have a bracket mounted to it as well that will need to be removed. lift the outlet off the engine and you will see the thermostat. lift the thermostat out clean the mating surfaces, install new thermostat ( make sure it is in the grove flat )and gasket, remount outlet housing. Put the rest back together.