2004 Chevy Van code PO300

2004 CHEVROLET VAN
213,098 MILES • V8 • 2WD • AUTOMATIC
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TODO513
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why do I only get code PO300, when driving above 65 mph ?, new plgs and wires installed. After clearing CEL I will get no MIL if driven under 65mph. Runs good no stalling, accelerates good, gas milage 18+ per gal.
Sep 3, 2010 at 5:54 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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