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On my way back from the exhaust shop, getting my 02 bung welded in, I noticed that I have a pretty radical surge going on at little throttle. The vette was not doing this until I hooked-up the new 02 sensor...
I agree, give it at least 3-5 start/warmup - stop/cooldown cycles to let the computer learn what is going on, and if it's still there, then start diagnosing.