Driving my 87 GN today, ran great all day, went to leave stop light and mashed the gas, it took off good then after about 2 seconds it just died. Cranks but will not restart, check engine light on and giving me a code 12 or 24, fuel pressure on gauge shows 40psi, sounds like pump kicks on when key is turned on so I have an electric issue I am assuming, any ideas where to start? Maybe ecm? Car is stock and hasn't been tampered with.