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Hi. My T-Bird is behaving very similarly. Mine's a 312ci V8 in a '57. I've replaced the coil, distributor cap. Plugs and leads aren't very old. Carburetor is a brand new Holley 600. I was driving along and mine started backfiring and farting a bit. Then it went away for a while and now has returned. Even affects idling. It feels like there's no fuel, but there's plenty. I replaced the coil first off, but that didn't make any difference. I hope it's not a dud! I've also spent time hunting for a decent vacuum leak, but there's none. You may want to try that too. PCV valves, brake booster, vacuum operated wipers, etc. Mine isn't backfiring anymore - just bogging down. I can't believe it's the ignition wires as the problem came on suddenly. Your situation is odd as you had it running well for two days after a new coil, then failing again. I checked timing, dwell, etc. first up of course. I guess you've done that. Curious to see if we have a similar issue.
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