Hi Robert,

I'm guessing that you are using an O-scope to see that voltage.

With the pin "Floating", and a High impeadance scope probe, it will balance out somewhere around midway between 0 and VDD just from the leakage currents.

A simple test is to put a 1k resistor from the pin to ground. The voltage should go away. You don't need that resistor for normal operation though.

With the ADCON1 setting you gave you should be OK to put a voltage on AN3. But if you are only using AN0, you might want to change it to %00000101 to open up some more digital pins.
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