2004 Chevy Van code PO300

2004 CHEVROLET VAN
213,098 MILES • V8 • 2WD • AUTOMATIC
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TODO513
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  • 1 POST
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
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Random misfires are normally caused by vacuum leaks and contaminated fuel
Sep 4, 2010 at 3:17 PM
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