So depending on Engine size, you either have 6 spark plugs or 8. The 6 cylinder doesn't have a cap and rotor, so just plugs and wires. The plugs are a 5/8 or 16mm socket. It is a special socket that has a rubber cushion to try and not break the plugs when removing or installing them. Regardless of 6 or 8 cylinder, you want the car to be cold for this. You grab one spark plug wire at a time, twist it back and forth, and pull straight away from the spark plug. Sometimes this is easier said than done. You want to purchase new plugs and wires, and if your car has a cap and rotor, you will want to get those too. I recall the '93 Z28 has a very expensive distributor cap, over $200 so maybe don't change that. The better brand of plugs come pre gapped. AC Delco is a great brand for Chevy. You want to put antiseize on the threads. Unscrew the old one, then install the new one. My favorite tool when doing this is a 6" wobble extension, as it seems to help with most plugs. You can take a piece of vacuum tubing 1/8" and stick it on the tip of the plug to help install the plugs without stripping out the threads in the engine cylinder head. You can remove one spark plug wire at a time and line it up for length with the new one in the set you purchased. Put Dielectric grease in the boot that goes on the spark plug end. Don't put it on the other side (Coil or distributor cap). Although there are many filters that can be involved in a tune up depending on the mileage of the vehicle, the biggest difference in how a car runs typically is spark plugs.
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