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I don't think lack of use affects them but they are known to have issues.
If you have a multimeter you can measure the resistance values you're getting at various throttle openings to determine whether it's duff or not.
You can also try unplugging it and see if it hunts on idle, if it doesn't I'm guessing it'll be knackered since a correctly working TPS will cause engine to hunt on idle due to the ECU not getting a feed and essentially having to guess throttle openings etc.
I could be talking complete bollocks though! Try your ICV first and if there's still a problem come back.
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