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Lee,
High CO indicates a rich running condition. When all is working as should be, the fuel and air will combine to produce CO2 and water vapor, H2O. At least in a perfect world.
First question: was the car fully warmed up? Higher CO is normal with cold engine.
Start looking at simple things. Change the air filter. Check the flame trap to make sure it is clear - check the small hose to make sure it is clear. Make sure the fuel pressure regulator is not leaking. When was the last time you changed the plugs, wires, distributor cap and rotor? Plugs are cheap and I would definately replace them, the other items not terribly expensive and if it has been a while they would get changed also.
If the engine coolant temperature sensor is faulty, the ecu may think it is cold and enrich the mix, but this would likely cause dirveability problems which you didn't mention.
I don't know all the model year changes, but the '89 may still have the screw on the amm for adjusting the fuel mixture. See FAQ for details.
One note of caution, you may find that when you fix the CO problem, that NOx emissions go up. This could be a problem if it is already close to the limit. The reason this happens is that the CAT uses CO to 'recuce' the NOx in the exhaust.
Check out this web site for more details: www.autoshop101.com Click on 'technical articles'. Within this list you will find several articles discussing emissions.
Good luck,
Dan
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