what do i do for a 2003 4x4 Chevrolet Avalanche 1500 shows a dtc p300

2003 CHEVROLET AVALANCHE
185,000 MILES
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WOLFROM
  • MEMBER
  • 2 POSTS
I need to fix this it shows the check engine light when i go over railroad tracks and at times when i idle.
Dec 13, 2011 at 5:50 AM
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RIVERMIKERAT
  • CAR REPAIR CONTRIBUTOR
  • 6,110 POSTS
Engine misfire detected. Check the plugs. Make sure they're properly installed. Make sure the plug wires are properly connected. Check the connectors and grounds for the coil(s).
Dec 13, 2011 at 5:58 AM
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