thank you for your replies. I should have mentioned that this is a 2005 gas Street Rod. This was just a routine annual service from a firm I found recommended by several people on TOTV. I notice the backfiring most often when I'm going down the hill about to turn into the tunnel. I've been out of town a lot recently so I haven't driven it anywhere except to the mailboxes for the past month or so, but I think it happens when I release the gas pedal. Does that make sense? I'll take it out tomorrow to try to nail down when it occurs.
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