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check both lambda sensors for breaks in wires and for open circuit on heater side of lambda sensor on the one under the car on the second cat,failed heater element will not heat gas engough for sensor to read causing false readings , also check for slow i.a.c valve on inlet manifold.
Internal oil leak, change the spark plugs and cables, oil, filter and add Lucas oil. Take the car for inspection and let me know how it goes. For the belt depends where you get the parts and who does the work.
High CO usualy means the O2 sensors are not reading properly. Take it to a parts store that can read codes, I know Auto Zone does in my area. If it is the O2 sensor it is an easy fix but the sensors run about $50.00 each.
daves944 is dead right . you could try thrashing the ars of it just befor it go in again most mot places will do it for you if you ask them ,, but be warned if it go bang witch it should not its not ther fault,,,, it has worked for me more then once
It is running rich. Verify the readings are within specs from the O2 sensors, they should fluctuate up and down once the car is hot, constant high reading is rich run, very low is lean or defective sensors, also clean the throttle body and air-bypass valve, changing the oil can help as well. Do you have any OBD 1 Codes in the system memory?