2500 - 3000 RPM bucking problem, at steady state throttle, on level ground or even more when going down gentle grade. Always reproducible when engine is hot (milder and not as reproducible when engine cold). No noticeable flat spot when accelerating, and no bucking when gas held steady from 3000 RPM to redline
Basic tune items good/checked
Key wiring ran, and grounds/earths clean and secure
All sensors within specs
No Check Engine Light codes
Fuel pressure steady & O2 sensor healthy/fast V fluctuation (w/DMM) during bucking
Injectors working with CEL test, but can't be sure what they're doing at problem RPM