Hi,
If it is backfiring, you could have either a lean or rich fuel mixture. Is it possible for you to record it cranking and then running so I can hear what it is doing?
I realize the parts have been replaced. Have you checked the fuel pressure to make sure it is within the manufacturer's specs?
Also, is the check engine light staying on while the engine is running? If it is, do you have an OBD2 scan tool?
Let me know. If you haven't already, check the fuel pressure.
Here is a link that explains how it is done:
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Also, take a look at this link. You may find it helpful.
https://www.2carpros.com/articles/engine-backfires-while-running
Let me know what you find. Also, I attached the manufacturer's fuel pressure specifications below.
Take care,
Joe
See pic below.
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Wednesday, November 16th, 2022 AT 8:52 PM