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My 99 carby does it and I like the sound. Its just a little unburned fuel sneaking out the exhaust valve or igniting in the exhaust system. As far as I know its pretty common in motors that have relatively aggressive valve and ignition timing. I have a custom performance cam in my 55 sedan (383 SBC) and it will also pop and gurgle out the exhaust when I down shift to decelerate.
 
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