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Frank,
If you've already hit 100% TPS prior to the backfire, and you're not noticing this anywhere else with rapid throttle changes, it doesn't sound like throttle enrichment is the problem.
Hopefully your tuner will be able to zero in on the problem, if you can duplicate the situation for him in the car. I've been using aftermarket standalone ECU's for many years now and I've never experienced anything like you describe.
By the way, noticed Tippy's comment earlier about experiencing this with the factory ECU. Do you still have any of those stock components in the car?
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