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TPS just monitors throttle plate position. Based on this measured throttle position, other things happen. Since your TPS voltages are changing when the throttle is not applied, there is a definite issue witih the TPS.
IACV opens and closes a small hole to allow air in. Based on the TPS, it could change how far open it becomes. If the TPS is saying it's at 1-2% throttle, the IACV would open a bit too, causing your perceived vacuum leak.
This could also be a vacuum leak elsewhere, but in my significant experience with vacuum leaks, your problem seems to be solely with the electronics at the throttle body.
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