If your real cheap you can take your plugs out a clean them off in kerosene or gas. Get all of the carbon deposits and whatnot off of them. If they are fouled with oil though, you should just get new plugs. they are cheap.
you will need a spark plug socket, an extension and a socket wrench. When putting them back in, make sure you don't strip the threads. And only do one at a time.
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