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We have a 2000 Impala and we had a similar problem in cooler weather but not in warm weather. However, I don't remember anything about the security light. When we took it to the dealer for the oil change we asked them about it, but I am pretty sure that it didn't do it when they started it. That reminds me, I am pretty sure that it did it mostly on cold starts. If you figure it out, please let me know. I will reply if we figure anything out, but I don't think that we will until winter, if then.
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