That's about the same amount of change in cubic inches too? Have you done the VE tables? You still have the 98-00 Vortec PCM?
I've confirmed my issue once again as EGR. Turned it off yesterday and fuel trims were back to as close to 0 as possible all over but more importantly same bank to bank.
Going to try turning off the individual bank trims and see what happens, more curiosity. Seems like it would be a patch for a known EGR issue?
Also going to check MPG on this tank with EGR enable MPH raised to 25 MPH
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