Hello,

My name is Chris. I have a 2009 g37s with a misfire problem that I cant figure out. First thing i did was change the spark plugs and ignition coils (car is over 115k miles). The car then ran perfect for about a week and it started misfiring again. Since the ignition coils i bout were aftermarket, i figured maybe they were cheap. So i replaced them with new hitachi coils. Again the car worked great for about another week. This time however, my battery randomly died and the car wouldnt start. After jumping it, i got the battery and alternator checked, and they were both good. So that was weird, maybe i left a light on? The next day, my car starts beeping for an alarm that the trunk was pen, but it wasnt. The alarm stoppe dafter 30 secs and never haasnt happened since.

Again, i change the ignition coils, along with the mass airflow sensor and the vvt valves. Again the car runs great, for 80 mile and then bam. Another misfire. this is where i am at today. Any idea of what could be going on The car runs great when i change the ignition coils but only for about 70-80 miles. THere is no oil in the tube. I have run out of ideas. PLEASE HELP!!

 

Any codes? My homeboy cars would start misfiring when the car got warmed up. Turned out he needed a new fuel pump. Pretty easy to replace. Just don't touch the gasket.