Sounds like a condensor or breaker point problem. When it just starts backfiring while running it is certainly ignition related. Most of the time condensors are the culprit but it can be an ignition module or distributor breaker points / sensor (if so installed.) Should not be to hard to sort out. I know most Vette owners are long ago or soon to be mechanics :)
Thanks for using FixYa!
Kelly
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