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Is it possible you turned the ignition on when you had the throttle body off and out for powder coating? Since there is no driveability issues I would assume it was a code that set during that process. I would check the TPS data with a scan tool, make sure they look good. Look for TPS1 and TPS2 to move smoothly with no dips or spikes. If that checks out, I would clear the codes and see what happens.
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