1994 Mercury Marquis Failed Emissions- High Hydrocarbons

1994 MERCURY MARQUIS
141,000 MILES • V8 • 2WD • AUTOMATIC
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JRUBIOC5447
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Can anyone tell me what it may-be besides spark plugs and coil pack cause I replaced them. Then I checked the cats and both good. Is there anything else I can do?
Oct 19, 2010 at 6:45 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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