Hi Christopher

I use the 18f85J90. My guess is you may have pin 12 tied to 3V3. VDDCore is a stand alone pin that is tied to a capacitor to smooth the internal core vdd.

Some fundamentals to check (I use a TQFP device)
RB6 (pin 52) is Clock PK3 pin 5
RB7 (pin 47) is Data PK3 pin 4
VDD (3V3) on pins 24,25,32,48,71 PK3 pin 2
GND (0V) on pins 11,31,51,70,26 PK3 pin 3
MCLR (pin 9) PK3 pin 1