Pic 18f252 not responding

[skimask]

Hey, guys I have been diligently searching the internet for information about my problem but cannot figure it out.
I have just switched from the 16f876 and am now trying to use the 18f252.
I loaded microcode's 18f252 boot loader using a JDM programmer and WinPic 800. The ICD cannot communicate with the chip for some reason. If I push the Loader information button it will tell me I have a different pic every time. Also I tried making a hex file for a blinking led and then programming it with WinPic but it blinked erratically. Tried a second chip, same thing. I used the same 20mhz resonator for the 16f876 and it works fine.

Any Ideas what might be wrong? I would really appreciate any tips.

Got a pullup on MCLR?
Got caps across Vdd and Vss? (the 18F practically NEEDS these, moreso than the 16F series).
What pin is the LED on?
Show us your program...show us your schematic...