2001 Lincoln ls v8 is misfiring Its cylinder 3 which one so you have to check all plugs?

Yes, even though the misfire is in cylinder 3, you should check *all* the spark plugs on a 2001 Lincoln LS V8. While one plug might be the primary culprit, a failing plug in another cylinder could exacerbate the problem or be on the verge of failing itself. Checking all of them ensures a thorough diagnosis and helps prevent future issues.