i had a similar issue with my ss, when it was raining out, my traction control would go crazy, going on then off. then my car started backfiring and missing. i was lost, but for my case, a fellow member over at ls1.com(back when i respected that site) told me to check the jet module i had recently installed onto the ecm a week earlier. he said he had one and it moved the harness back enough that it rubbed wires on the hood hinge and wore away the insulation and when it rained, all sorts of things went haywire. well i checked mine and thats what it was, i removed the module repaired the 3 worn wires, and no problems since, so maybe you have a worn wire somewhere and with water it makes a short. hope that helps a little.
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