How do you change the spark plugs on a 1989 4.3 s-10 and where are they?

you need to buy spark plugs and spark plug wires first. Buy a spacer so you can replace the spark plug back into the hole correctly. First, take the spark plug wires off the spark plugs BUT NOT OFF THE DISTRIBUTOR CAP!!! Then, put the new spark plugs in using the spacer and ratchet. It doesn't matter which spark plug goes where. (wrench, pliers, whatever). Next replace ONE WIRE AT A TIME so as not to mess up the firing mechanism. Make sure you replace the wire in the exact position as the old one was. Otherwise, if replaced incorrectly, the engine will fire each piston at different times. Then, start the engine. If your engine starts to gurgle or sound funny and vibrates, that means you have incorrectly replaced the wires and you need to switch the order of the wires. If the engine is running properly, good job!