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29 Model A keeps backfiring thru carb.

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Hello everybody. Hope everyone is safe from all that is going on in the world. I need some help. I finally got my 29 sorted out (or so I thought).  I've got a newly rebuilt Zenith 1 carb on my car and every so often at 1/2 throttle or so, it backfires thru the carb. Not always but enough for concern. I feel like the timing is dead on and I've followed the carb tuning that I found on another site. No change however. Any ideas or suggestions would be appreciated.

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