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Debbie, code p0300 is a random misfire code,
- bad spark plug (s)
- bad ignition coil (s)
- plugged or faulty fuel injector (s)
- Intake leak
- injectors harness is open or shorted
- Injectors circuit has poor electrical connection
- Ignition coils harness is open or shorted
- Ignition coils circuit poor electrical connection
- Insufficient cylinders compression
- weak fuel pressure
see links below,
This may be due to misfire or needs a tune up, the other problem may be weak fuel preasure, have the computer scanned for any stored codes, see if there are any misfire codes if so i would start with a tune up. one more thing i see alot of on these is check the fuel preasure regulator, remove the vacuum hose from it and start engine if fuel is leaking out of the fitting then replace regulator.
Yes it could , try having the computer scanned for any codes and see if theres a misfire code, if it where a coil there should be a misfire code with the cylinder thats missing then you will know which coil it is, also the fuelpump is pushing enogh preasure? low preasure would cause this also. try the codes first, autozone parts store scans for free. hope this helps.
Have you tried replacing the ignition coils? If they get old and stop working, or if they're damaged, they won't send a strong enough spark to the plugs. AutoZone (I think) apparently does free diagnostic codes for a check engine light. I don't know if you have a check engine light on or not, but maybe the light burned out? It might be worth a try to call them and ask if they can check the codes for you for free.