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Old 09-07-2017, 02:20 AM   #2
[ion] C2
636 whp
 
Join Date: Aug 2006
Location: AZ
Posts: 11,872
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What Causes a P0300 Code?
  • Low Fuel Pressure
  • Vacuum Leak
  • EGR system malfunction
  • Internal Engine Problems (such as low compression)
Less Common Causes
  • Faulty Coil
  • Faulty Spark Plugs and/or Wires
  • Camshaft or Crankshaft sensors
  • Ignition module
  • Computer
http://www.myautorepairadvice.com/p0300.html



Only time I ever have random misfires is when I have a vacuum leak (or major head gasket leak). Vacuum leaks also tend to be my most commonly faced issue over the years with various hardware attached. I am currently fixing some this week, in fact.

Could also be bad upstream O2 sensor. Can test by electrically disconnecting the sensor. If problem goes away, that's what it is. I've also had bad O2 sensors.
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