2011 370Z SES light p0304/p0300
 

2011 370z 55k miles bought with 40k miles in March 2014 always filled 93 octane from the same gas station.

Ok now that that's out of the way, I recently got a p0304 cylinder 4 misfire. Called Nissan the tech said could be cuz we switched to winter blend fuel and the car is acting up. Just reset the light and add isoheet INCASE there's any water in the fuel. Did that and 400 miles later went on again p0300


I don't feel or hear any misfire at idle or throughout the rpm range. Any ideas? Is this a known issue? Could it be just a fault? I'm assuming to check plugs if it comes on again. Tips hints lmk

Random cylinder misfire, dirty/beaten plugs, ur running tooo rich. Am guessing u have been driving hard lately due to cool weather?