how to fix p0300 code

2006 CHEVROLET HHR
152,000 MILES
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DEZARN28
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check engine light came on last week, but went away?
Apr 14, 2013 at 1:36 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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