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Brad,
If your CIS lambda is stock, the PLX is doing nothing at WOT. The throttle switch grounds the ECU pin after 35% throttle and the system goes to a default duty cycle and ignores the O2 sensor signal. If you want the wideband to affect WOT, you need to disconnect the switch. If you want two different AFR targets, you will have to use two outputs and relays.
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Paul
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