The ECTS is the heart and soul of the Saturn and will cause all sorts of issues. You bought the good one that has a brass tip, right? If it is plastic-tipped, take it back and get the brass one. Also, did you notice any corrosion on the connector? If so, replace that as well.
If the high idle reappears, try turning the car off and then immediately restart it. If the idle returns to normal, then your TPS is bad or dirty. Remove the throttle body and clean it, the IAC and TPS. If you have to replace the TPS, get the Delphi/Delco part, do not use aftermarket!
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