Hi all: I hate to throw the proverbial monkey wrench into much of what has been suggested but, as John is aware, I have had the same problem for well over a year, except that mine backfires through the driver's side carb (at least I think thats the one) at times just leaving a red light, as well as in a turn. Occasionally, although not often, it will do it when I am trying to start it as well, but I think that is just buildup in the carbs. While John's car limits its tantrums to left turns, mine is not so particular and, at times, will do it in either direction. Please understand that this is intermittent, not constant, and it has to be a turn where you are moving fairly well, but not too fast (like maybe 10-20 mph). At speed, with your foot on the gas, no problems whatsoever. Just thought I would throw this in for whatever it may be worth. Pete Fitch