Hi,
If it backfires, it could be timing related. However, that would also affect compression. What pressures did you find when tested?
Also, with the key in the run position, check each fuel injector for power. Each injector will have a red wire going to it. (See pic below). Confirm there is power present using a test light or voltmeter.
Let me know what you find.
Joe
See pic below.
Image (Click to make bigger)
Tuesday, September 6th, 2022 AT 6:02 PM