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If it is any help, I had the same problem a few weeks ago with cylinder 4. My misfiring cylinder had a noticeable effect on engine operation, so it seems like my problem was more severe than yours. I couldn't see a defect on the spark plug so I changed the coil pack on that cylinder and it fixed the problem.
I wish I had thought about switching the coil packs to be sure of my diagnosis. The part was around $55 with shipping and I didn't like guessing that was the problem.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 997 adaptive sports seats, Litronics, silver console
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