Measure the resistances across the TPS connections as detailed in the EFI section of the TSRM. Disregard the info you have concerning the voltage, if you look in the ECT section of the TSRM you'll find it specifies approx 4v.... The ECT computer pulls the voltage down, a manual equipped 7M should have 10v to 14v. It's pretty broad as it's not there to give any signal beyond on/off.
A bad IDL switch isn't going to cause you to run rich either.
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