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Know the car component that you need. Nothing could be worse than purchasing a car part only to find out that it doesn't fit. As much as possible, when you go to the store, bring the part that needs replacement to make sure that you get exactly what you need.
Being cheap about car service just isn't a good idea. Any problem can be lethal with a car, and as all drivers know only too well, near misses are usually a result of both cars being able to perform. It doesn't take a lot to turn a shopping trip into a trip to the hospital, and that's definitely not cheap.
Changing the brake pads is the next step. Remember that there are books at your local auto parts store, on eBay, and at any bookstore that you can also buy. These will give you step by step instructions along with picture illustrations as to how to change and maintain brake pads.
Reattach the correct plug wire to the new plug with a twist on the boot until it's firmly seated on top of the plug. You should feel and hear a click as the wire positively clamps onto the spark plug.
Lastly, if you are either a mechanic or someone in that league of under-the-hood skills you can always try the auto yard. Because these cars are sometimes used for unsanctioned racing you can usually find imports at the junkyard. "Pick a part" type auto parts businesses tend to work with salvage and insurance companies to get choice wrecks, and while you probably wouldn't go there to get an RX-7 door panel, they are perfect spots to find interior RX-7 parts and engine parts. auto salvage parts that come from "pick a part" yards are usually pretty cheap because you are doing the finding and removing of the part all by yourself. Again, this is recommended only if you really know what you're doing. A mechanic who works with cars every day can spot a useful part from a throw away, can you?
One outlet for used car parts is the local newspaper's classified section. Run an ad and see what happens. Selling parts from your car isn't going to make you a lot of money, but it beats just leaving them on the car as it's towed to the junkyard. You can also sell your car parts by word of mouth. You never know what can happen.
Next, have a look at the cylinder head threads. Are they in good condition, clean, and free of dirt? New ones should freely screw into the cylinder head by hand. Any binding of the plug is an indication of debris or damage in the thread. TIP: lube the plug threads with a little grease or spray lubricant before you install them, this will make for an easier removal at your next spark plug change.
