I already have a wideband o2, if it was pump related I would be lean at wot as well which is not the case.
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This is not necessarily true. For example. My in tank pump is partially clogged. I get a hesitation and surging at partial throttle. But at full throttle it's fine. The ecu operates differently at full throttle vs partial opening. Parameters can move differently. A fuel pressure gauge would be helpful to verify pump pressure under partial throttle.