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Originally Posted by StevePT
The plug wires are the standard AC Delco wires so I would assume they're the originals that came on the car in 99. The car has about 60K miles on it.
Like I said, all of the wires had low resistance, (1-3K ohms) per wire except the two wires that were connected to the coil pack which had rust on the terminals measured out at around 90K ohms.
This evidently isn't a very common problem because I did a search on the words "rust coil terminals" and only came up with one thread where a guy had the same issue.
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I don't believe rust on the coil terminals is common but it probably depends on where you live. I don't have any on my 3 "W" bodies but I'm in the desert Southwest.
I have heard of moisture contamination under the coil packs causing ignition control module (ICM) problems. Arcing may be visible.