"Gross polluter" '91 200Q -- help!

[Arun Rao <rao@pixar.com>]

Took my car in today for the biennial smog check (California). Bad news:
the guy says the car's a gross polluter, and won't pass. He didn't run
the
entire test, because he would have to report it to the DMV if he did. He
suggested I have the car looked at right away .. the HC and CO levels
are
both extremely high.

Any one had a similar experience?  Car's running like a top, except for
occasional hard starting (10 cranks instead of 3) when cold. No idle
fluctuation.
But .. I haven't replaced the O2 sensor in 35,000 miles, and the plugs
are
probably still original (they looked fine, though).  The car has 73K on
the
clock.

Thanks in advance!

-Arun

--
Arun Rao
Pixar Animation Studios
Pt. Richmond, CA 94804
(510) 620-3526