Proramming issue with pic16

Hello

I am looking to use the analogue inputs from PGC & PGD (programming pins). I know I need to isolate these pins from the external circuit to prevent distortion while programming. I usually put a small 0.1uF cap to ground on analogue inputs for a bit or suppression, but how would it go about trying to use PGC & PGD and the Cap? I want to try and avoid using a resistor as this will interfere with the analogue value.

So, bottom line question - How can I use PGC & PGD as analogue inputs reliably?

PS - I need to use PGC & PGD as I have no other analogue pins available and I am unwilling to change the chip at this point.

any ideas are welcome

Graham