2003 GRAND AM GT WITH ERROR CODE PO300

  • Tiny
  • samantha1122
  • 2003 Pontiac Grand Am
  • 51,000 miles

I have an 03 Grand Am with 51k miles that is giving an error code of PO300, random cylinder misfire. Changed plugs, plug wires, coil packs, and fuel injectors. What would be the next and easiest thing to try/change?

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Saturday, September 3rd, 2011 AT 8:47 AM

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  • Tiny
  • KHLow2008
  • Expert
  • 41,997 posts

Check the engine compression and fuel pressure.

Ensure exhaust is not restricted.

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Saturday, September 3rd, 2011 AT 9:53 AM

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