Ok so i picked upo this g35 with a multiple random misfire code. Its running rough... Ive replaced lower+upper intake n plenum gaskets, plugs, 3 coils (tested with voltemeter), and 1 injector (damaged)... Still nothing... And I have no idea what to do... Im pretty good with cars and I have an OBD2 scanner with Live data, and plenty of various tools/testing items but no idea where to look...
what could be causing this code?

Symptoms experiencing:
Rough Idle
Back firing
Loss of Power
Smells rich

 

Just curious, did you get a really good deal?

Sorry, don’t have much help I can offer, but something I’ve come across on here is the coils being mixed up; the one for the 4th cylinder being plugged on the 6th and vice versa. Pretty sure that’s not your issue, but I thought I’d throw it on here.

 

I've seen a lot of people do what he was describing...
on the left(drivers) bank the 2 coils (#2/#3) closest to the firewall often get swapped on accident. It will make for a LOPING idle sound and kick all the CEL and other lights. It exhibits the exact symptoms you are describing.

 

seemed to be one of those suggestions that I thought to myself "no way, but Ill give it a shot"
So i switched the two coils stated... And sure enough, runs perfect now... Absolutely great... BUTTT, now all the lights on the dash came on that you spoke of... How do I go about getting these off? Anyways, Im a small time dealer getting started in business. I picked this car up from an auction for $6500 so it was worth it but very frustrating to figute out two swapped coils... LoL... Thank you for your help! any suggestions on the instrument cluster thats lit up like a christmas tree?

 

Any code? gas? have you check wires? MAF sensor and TB?

 

Awesome that this helped!