It sounds like yours may be ok, essentially you want it to be 5V with throttle closed, 4.99 is fine.

If your meter has a continuity function it should not beep when you measure between the TPS pins then will beep/register resistance when the throttle is opened.

Another thing you can do is start the car with it unplugged and see if it makes any difference to the idle.

Irrespective of this, the base idle will need to be setup, as it's been adjusted.

Martin