91 350 tbi extreme exhaust backfiring

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ChevyGuy572

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May 16, 2024
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Ok, update, I haven't gotten an ecu yet but, I looked up parts numbers and found that the tbi on my 350 was designed for an engine that is 104 cubic inches larger. I plan on getting a new ecu, but when I do, is it possible to tune it to make more power using the 454 throttle body?
 
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