i have a 93 siverado tbi and when i gun the gas it cuts off like it ran out of gas or flooded it .it also will shout a flame out the breather
how old are the muffler(s) and cats, they may be plugged or restricted
Usually back fire through throttle body,has to do with a timing issue.
Ignition timing is off, or firing order got messed up. Worst case is the timing chain jumped a tooth
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