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If the LH ECU does not have a TPS signal from what I know (non-TCS) it will run in a open-loop program (sorry I said opposite before) which is most likely a pre-programmed map. I then translate as keep it at base boost.
and since it cannot determine you are at closed throttle as well as wide open it will not adjust fuel optimally.
just drive it easy till you can swap the ECUs.
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