2003 Saturn Ion C02 and Random Misfire

2003 SATURN ION
175,000 MILES • 4 CYL • 2WD • MANUAL
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PFOOTMOM
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Car running badly and stalling. Ran code reader- codes 137, 141 and 0300. Replace O2 sensor #2. still get random misfire and engine light came on after erasing codes. Ran code reader again, code 0300. What could it be? What causes random misfire?
Nov 28, 2010 at 7:39 AM
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RASMATAZ
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Random misfire is usually caused by vacuum leaks and bad fuel.
Nov 28, 2010 at 9:32 AM
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PFOOTMOM
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Thanks. The car doesn't appear to have many vacuum lines but I will check again.
Nov 28, 2010 at 1:18 PM
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PFOOTMOM
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in addition to random misfire, the timing is advanced to 37 degrees at 2500 rpm - what is this?
Nov 30, 2010 at 4:57 AM