Help misfire in rear rotor, bad front o2, low voltage.

I am having issues my 8, recently just happened after I drove it from sitting for 3-4 weeks, I forget. Anyway, got in the car and I notice a very minor jolt while giving it a pull in sixth gear to jump up to 70. So I duplicated this and it did it again. I also saw the cel start flashing (I have a full exhaust minus header so I am used to the cel for the rear o2) but it has never flashed before, signaling a misfire. So I went and got it checked at autozone. I have a custom ls1 kit with msd wires and new plugs that never gave me trouble a few months before letting it sit for this period. I got it checked, and found the low voltage error, the front heater core, and two signals of misfires in the rear rotor. I did a 20 pump brake for the eccentric shaft sensor to reset it. Still nothing and now I am not sure where to go from here. I replaced the front o2 about 4 months ago and so this is why I am confused. Any help will be great! And I will get codes up later, I will haveto get it tested again for exact codes.



My thoughts,



Obviously, to me at least, the low voltage is giving my coils not enough juice to fire properly, causing the unusual misfire and thus the front o2 is registering the misfire against the reading it is expecting of no misfire. But I am not sure. I don't have a volt meter at the moment to test the alt to see if it is going bad at all. Also, It cannot be a bad ground. I have a grounding kit installed as well.



Thanks in advance!