Quote Originally Posted by keithdoxey
For devices such as the 18Fxx31 which have power supply (Vdd and AVdd) and ground (Vss and AVss), all pins must be used in order for these devices to program.

Reverted to the smaller caps and checked the voltages while programming. 4.97v on one set of pins, 5.01 on the other set. Wasnt sure if this was because only one set were powered and the lower voltage was fed through the PIC so I removed it and attempted to check the voltages.
Had another thought after posting that. Maybe the different voltages on the two sets of pins could have been causing a problem so I connected them together and stuck 1.0uF on there as well. Still didnt work