2009 Infiniti G 37 all wheel drive having problems with PO 300 engine code. I am dumbfounded I put new spark plugs in it. I also put new coils in it but I put cheap ones in them. The light went out and then the next day I got up and got in the car and the light was back on. Does anybody have any idea if it happen to do with them being a cheaper brand of ignition coils they were called aceone ignition coils when the light is off it runs good, but when the light is on it items a little rough and a little high and sometimes it will tick, but when the engine light is off, it does not do none of that stuff somebody please give me some information on this problem. Thank you.

 

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