Poor Mary, that is a rough road to go slow on.
Try cleaning the Electronic Throttle Body. Be careful with the power plugs, they are fragile.
From Matthews Volvo site:
As for your Throttle Position Sensor try this out;
Turn ignition to position ll and wait,
A calibration process should be audible within about 30 seconds or so,
Wait until the calibration finishes,
Turn back to position O and wait 5 seconds and start the vehicle. This should calibrate the Throttle and might fix your TPS codes.
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Keeping it running is better than buying new
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