I might be wrong, but since a PC only piggy backs the ECU fueling, it can't override, only add or subtract.
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So when the ECU signals to cut the injectors on zero throttle, the PC can't add anything, because the injectors are essentially shut off. The only way would be to tweak your TPS so it thinks you've always got a very slight amount of throttle active.
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As I say, could be wrong though.