Wht up new to this site having a little problem with my nissan first my car have trouble code come up as crank sensor but I changed it no difference then it stopped starting come to find out after changing a fue parts it turned out to be the maf sensor car started now it hard starts I changed everything in the fuel tank not sure now if the pump is weak or something else is wrong and some times I throws a p0300 code stays on for a couple of days then gos away and stays off for a fue days and comes back so I changed the fuel tank seal now it has not come back yet but still hard starts anybody have an idea what's wrong

 

punctuation, please

 

The P0300 says that you are having two or more cylinders mis-firing. Since the problem will go away for a few days, this will be hard to find. The P0300 does does not tell you exactly which cylinders are having the problem, which also makes it hard.

Most of the time P0300 is caused by bad ignition coils. Unless you get a code like P0301 or P0302 or P0303 or P0304 or P0305 or P0306, all you can do is guess - unless you have a lot of money and replace all 6 ignition coils at the same time.

 

IVT solenoid can cause these conditions without throwing its code. I think the car would still start easily even if coilpacks are messed up.