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colleen 3/22/2011
1996 Pontiac Grand Am SE 4Cyl2.4L - Engine
when tested on code reader says random misfire when driving down road will misfire
we have changed spark plugs boots ignition module one fuel injector. i have also run fuel injector cleaner throught the gas
2 Answers
  • Jason
    Jason 3/22/2011
    It could be a vacuum leak, stuck EGR, low fuel pressure. Were there any other codes besides the p0300?
  • Mayor
    Mayor 4/28/2011
    You said you changed the spark plug boots but how about the plugs? I had this code on my Grand Prix and new plugs fixed it.

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