Here's the problem:
I had a hard crash on AH, and in rebooting, my BIOS settings got reset.  I reinitialized them and came up.
Since then, whenever I play AH online, I get this annoying stuttering.  FR will be steady at 37, for example, but several times a second, the screen will freeze.  I tried playing AH in offline mode while connected to the internet, and I did not get this problem.
I then checked my IRQ information, and found my modem and vid card on the same IRQ.
Here's my question: 
how the hell do you break 'em apart?
I've tried switching between bios-controlled PnP and OS-control, no dice.  I've tried uninstalling the modem and letting it reinstall it. No good.
I have plenty of IRQs lying around they will work.  Do I have to physically remove the hardware or flush the ECSD information to solve this?
Anybody know how to fix this up?