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when the engine is cold during the winter months it starts fine then approximately 3 minutes later it idles very rough then goes away after a minute or 2.
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This may be a long-shot-
I don't think anyone has mentioned anything about the GP relay or afterglow, but this may be part of the problem. The rough idling after 3 minutes could be the GP's cooled after the afterglow cycle. This would also explain why it gets better as the weather gets warmer. If the car was driven shortly after it is started (before the 3 minutes), would any rough running be noticed?