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DTC p300 what do I do to fix it

Tiny
WOLFROM
  • MEMBER
  • 2003 CHEVROLET AVALANCHE
  • 185,000 MILES
I need to fix this it shows the check engine light when I go over railroad tracks and at times when I idle. And I changed the spark plugs all cables have been replaced what I wanna know is what do you do with a random or general misfire.
Tuesday, December 13th, 2011 AT 6:10 AM

1 Reply

Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Same answer here. P0300 means an engine misfire has been detected, Make sure the plug wires are firmly seated on the plugs. Make sure the plugs are properly installed. Make sure the wires for the coil(s) are properly connected and that the grounds are clean and tight.
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Tuesday, December 13th, 2011 AT 6:13 AM

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