2000 Tundra 2WD - What's the cylinder decree?

Auto Zone read the "Check Engine" light and says cylinder 4 have a problem. How do I know which is #4?
2000 Tundra, 2WD, 8 cylinder 4.7 liter. It started running rough - very rough - from one day to the subsequent. I've changed the spark plugs (paid about $7 each, so they're OK I guess) also changed the (after cat) O2 sensors. (that be also read from the check engine light) It runs much better now, but still is rough. The spark plugs have be in about 10 days - I guess I could verbs them one at a time to see if one is fouled already. I'm thinking it could be that the #4 injector is bad, or maybe the (spark plug extension) is impossible. What is that thing called BTW?

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Answers:    if ur working on you own motor get shop manual...15 bucks..ull stockpile $ first use...

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