The electrical fuel injector connectors (2 of them) are located on top of the fuel injectors which are located on top of the throttle body. Assuming this is a 4.3L engine.
The connector is "keyed" so that it only goes on the injector one way. Locate the key on the connector to be replaced then note how the wires go into the connector and put the wires on the replacement connector in the same orientation.
It has a multi-point fuel injection system with one injector on each cylinder.
If it is just one injector, it is a bad injector or a problem in the wiring harness or connector for that injector. If it is all of the injectors, it could be a fuse, the entire injector harness, a broken loose or unplugged connector on the injector harness, or the fuel pump or fuel pressure regulator.
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The fuel injector would be located on the fuel rail up under the intake manifold towards the side of the engine.
The fuel injector pressure regulator is located in the injector fuel pump. Most pressure regulators cannot be separated from the fuel injector pump.
It is inside the upper intake manifold. It is attached to the fuel injector poppets with a bracket. To inspect/replace you must remove the upper intake manifold.
The fuel pressure regulator is located under the upper intake manifold. It is attached to the bank of injector poppets, AKA the "spider".
This is confusing, a 1998 does not have a carb.