So recently I bought a g35 coupe, when I bought the car it had a dead battery, the car only ran with jumper pack. I bought a battery and put it in, and after that the car wouldn't start even with jumper pack. It would crank then start, but it would shut off right away, sometimes I can give it a couple revs. Like 2 weeks later we scanned again and it only read one code for crankshaft position sensor. Which I replaced prior to scanning, I also replaced the pigtail for the crankshaft sensor. And it didn't do a thing.