High HC - Hydrocarbons - Indicates a misfire condition (incomplete or
inefficient combustion).
* Ignition problems
* Carbon deposits in combustion chamber
* Overly lean A/F mixture
* Increased camshaft overlap
High CO - Carbon Monoxide - Indicates partially burned fuel (not enough
oxygen for complete combustion).
* Overly rich A/F mixture
* Dirty air filter
* High fuel pressure
* Dirty injectors
* Sluggish/inoperative Oxygen sensor
* Dirty oil
(from 20v.org)
try changing air filter, O2 sensor, and oil as well as spark plugs and see if that helps
oh and yeah, heat up the engine just before the test.