Just started one night during a MP race. The game "stutters" for just a moment and it happens roughly every 5 seconds. The game worked great for awhile before that and I just can't think of anything that changed!
New PC (work computer) running Windows XP Media Edition. I used End it All to kill most non essential stuff. Its got to be running as barebones as I can get I think. AMD 64 3400, Nvidia FX5200. Plenty of power. It was using onboard sound and I killed that and installed a sound card. I can disable the sound card, run LFS with no sound, and the problem still happens. Installed the latest Nvidia drivers to no avail. This is one of those "weird PC things" that makes you want to throw it against the wall if it weren't for cool sims like LFS!