Bad , bad , bad coil.
All external coil users , I'd suggest checking your coils once in a while.
I changed mine and it idles very good. I am suspecting I'm having a weak spark with this on since it's 189,000 miles.
I also noticed that Wagon coils are slightly bigger than sedan and coupe coils. The one I have now is a wagon coil ,I guess it makes no difference besides the size.
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