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I think that's normal for LS1's. Mine does it, as well as several others I've encountered.
As far as the SES light, you'll need to have someone with an OBDII scanner check it out for you. The OBDII is kinda funny sometimes. I've diagnosed a car that had the engine light come on for a blown fuse. Another because it had cheap gas and misfired once. The best one yet was a truck that had the engine light on because some dirt got in the valve body and caused it to slip once. I never thought an engine would come on for a tranny problem. Make sure when you get it scanned they tell what code number it's reading. That way you can verify what they say is wrong.
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98 Drop top Z, Silver and black
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