Tricks to getting php to run smoothly on IIS 6

I've had a few problems with memory leaks on my windows server, I
think it has something to do with running php scrips on the box. The
server is fine when the inetinfo process is no larger than 200 MBs.
After that there are huge hickups in it where the CPU resources go to
100% and no pages can be rendered. Has anyone seen this type of
behavior on a II6 with php 4.3.8? I'm using IIrecycle to refresh the
process after 150 MB of memory usage but I'd like to find a better
solution.