Join Date: Mar 2005
Location: Scottsdale, Arizona
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bad plugs are usually the culprit of high hc levels..
or it can be burnt exhaust valves, slight vaccuum leaks, dirty/leaking fuel injectors, clogged fuel filter or bad fuel pump(all lead to poor fuel pressure, and can cause elevated HC lvls)
can be tons of things but bad plugs are the easiest to check for, and go from there.
have your compression checked, as well.