code po300 tried to fix

2003 NISSAN SENTRA
179,000 MILES
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BROOKMILLER
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  • 1 POST
I have the code po300 and ive tried to fix it and spending countless money on parts i don't need cause its not helping the misfire issue need help

replaced the wire set and cleaned all the sensors and everything but the problem is still there?
Oct 11, 2012 at 3:28 AM
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MHPAUTOS
  • ✓ASE Certified Mechanic
  • 31,937 POSTS
  • ASE Certified Mechanic
Random multi cylinder misfire. may be a coil problem, plugs, egr valve vacuum leaks i would try and get a run on an engine oscilloscope, this will help nail down the exact cause of this problem.
Oct 11, 2012 at 8:26 AM
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