Code 41 is a break/short in the THA signal line or a problem with the ECU. Code 51 is the TPS IDL switch (completely different wires), the A/C, or a fault in the ECU. Test the wiring, test the IDL switch for continuity when closed... if possible try another TPS.
The TPS is used to not only trim fueling but also to tell the ECU when the engine is at idle so it can properly modulate the ISCV.
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