This is a new one for me. Car starts fine but then immediately dies after one or two seconds. 90 g-body with vnt electronics and a fwd 3 bar cal. Codes 12 , 66 (yes I checked it twice), 53, 41 and 55. I am not concerned about the 12 or the 55. The 53 as I understand it is ok to have on a redone cal. the 66 is not in the in the 90 FSM so I have no idea as to what that is all about. the 41 is alternator related, but would that shut down the car? I tried a new ASD with no change. I do have an MSD 6al2 box in the car, but to my knowledge that should either work or not, and not cause this issue (but I could be wrong - may need to bypass the box to see what happens). What might be the symptoms with a bad coil?

Thanks in advance for any leads on this.