Mass Air Flow Sensor or Cylinder misfire


#1

Hi,
2001 Olds Alero. i’m getting a P0300 reading, Cylinder misfire, and i was told a coupld months ago my mass air flow sensor was out of range. are they related? how serious is a misfire? can i drive a couple hundred miles before service? advice and education welcome


#2

Could be bad plugs, vacuum leak, low fuel pressure, bad battery, dirty battery connections… Watch this video and it could help. https://www.google.com/url?sa=t&source=web&rct=j&ei=PBD5U-iqKsSoyATbj4GoDQ&url=http://www.youtube.com/watch%3Fv%3DOyvdWeyDHf4&cd=2&ved=0CB8QtwIwAQ&usg=AFQjCNFXsj6XiBhCBp1GWqnCvvqIsLfyQw&sig2=ehcTFhFSi6AJ8qoeDMI3sw


#3

P0300 is multiple cylinder random missfire. I would not drive that long on a missfire the unburned fuel can destroy your catalytic converter. I would start off checking the ignition coils and module. If memory serves me correctly the coils were mounted to a module and both were prone to failure.