i've been chasing this misfire on my 08 g37 for a while the first code i ever got was a p0420 disappeared and never came back then i started getting p0300 and p0037 ( which is now gone ) i've replaced spark plugs and the coil pack then i started getting p0345 and p0340 i changed both camshaft sensors code disappeared now i'm only getting p0300



Primary Code P0300

Fuel System 1 Closed Loop

Fuel System 2 Closed Loop

Calculated Load 38.4%

Engine Coolant Temperature 142 °F

Short Term Fuel Trim Bank 1 8.6%

Long Term Fuel Trim Bank 1 -10.2%

Short Term Fuel Trim Bank 2 25.0%

Long Term Fuel Trim Bank 2 9.4%

Engine RPM 875

Vehicle Speed 0 mph

Spark Advance 7.0°

Intake Air Temperature 32 °F

Mass Air Flow 1.57 lb/min

Throttle Position 4.3%

Oxygen Sensor Bank 1 Sensor 2 0.290 V

Short Term Fuel Trim Bank 1 Sensor 2 99.2%

Oxygen Sensor Bank 2 Sensor 2 0.270 V

Short Term Fuel Trim Bank 2 Sensor 2 99.2%

Run Time 61 seconds