Does a 1998 ford ranger have distributor cap or rotor?

Yes, a 1998 Ford Ranger, depending on the engine, likely has both a distributor cap and rotor. However, this is not guaranteed. Some 1998 Rangers had coil-on-plug ignition systems which would not use a distributor.

To be certain, you need to check your engine. Look under the hood near the engine's top. If you see a round component with several wires going to it and a central rotating part, that's the distributor. The cap is on top, and the rotor is the central rotating part inside the cap.

If you can provide the engine size (e.g., 2.3L, 3.0L, 4.0L), I can give you a more precise answer.