"bmwguy2" > wrote:
> My car's idle is not stable (it fluctuates b/w 800-1800 RPM) and I was
> told to replace the O2 sensor and it might fix the problem

The E36 has a tendency to foul idle control valves. One that
is not working correctly will cause an idle fluctuation. First you
can try cleaning it by removing it and spraying well with throttle
body/carburetor cleaner. If it is especially dirty and stuck you
may have to replace it.

I had a really fickle E36 which required both an idle control valve
and an airflow meter to stabilize the idle. Just be sure you have
checked all the vacuum areas first.

Bob