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Move the coil pack from 5 to another cylinder and move the spark plugs to a third. Then clear codes and drive until it sets again. If it followed the plugs or the coil, it's pretty easy. If it stayed with cylinder 5 then it's a compression problem or an injector problem. Compression can also mean a bad lifter or something where it doesn't breathe in enough air. So you'll get a weak cylinder yet it will pass a standard compression test.
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