Hi, I have a 1990 infinity q45. It stalled while driving and had to be towed home. There is a lot of gas, we had the fuel pump tested, all fuses and relays are good. The car battery is low so we are trying to start it with an emergency starter kit thing, the one you connect to your battery. It cranks but will not start. I am just about to give up, can someone help find the cause?