I'm trying to find out all the causes for the p0300 missfire code. my car will run fine for a day or two then itll run like its on 4 cyls. my bank 2 short term fuel trim blms drop to 80 on my scanner and stay there along with constant low readings on my bank 2 o2 sensors. any of oyu guys that have found the cause for your missfire please post it here........

 

Could be bad plugs, burnt wires, Bad Opti, O2 sensors.... The Coil, Coil Wire, ICM ...

 

hope its not the icm...... im gonna have to dig into this soon. the car will run like that under 2500 rpms but when i give it more throttle itll run fine again and stay that way for hours.