I desperately need help, I was changing out the crank/cam shaft sensors. While I was tightening the top one my tool hit the positive terminal and created sparks. After replacing the sensors, the altima only started once and stopped starting after that. Right now it's cranks strong and battery is good. But it just won't start. I've replaced the spark plugs and checked my relays and fuses. Still can't find what the problem is. But one thing is that it started when I jumped thr battery. But doesn't make sense to me because the battery is still strong. I have a small feeling that my fuel pump isn't activating when i turn the key though.