look on the intake manifold it will be stampes into the manifold cast.
A 1991 Toyota 4runner is bigger than a 1990 4runner
While owning a car, it is important to know its firing order. The firing order for a 1991 Toyota Corolla is 1 3 4 2.
For MR2 2.2, production years 1991 and 1993 the firing order is (1,3,4,2).For other years I don't know.
firing order for a 1991 cadillac deville
go to the Toyota store n ask them if they don't no go on Google and type in this how toinstall rear speakers on a 1991Toyota 4runner
it mounted on the throttle body