Hi,
Oftentimes, a backfire is caused by a lean or rich fuel mixture. Have you checked the fuel pressure and the fuel pressure regulator by chance? Let me know.
Next, take a look at this link and let me know if anything helps:
https://www.2carpros.com/articles/engine-backfires-while-running
Let me know your thoughts.
Take care,
Joe
Note: When this happens, pay attention for gray smoke from the exhaust or a rich fuel mixture odor.
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Thursday, June 8th, 2023 AT 9:17 PM