I have a 91 cadillac coupe deville had it for 4 years now. So the problem it has now is it turns off while driving really slowly or when on a stop. It does not turn off in the freeway or going high speeds. Now me and my mechanic friend addressed the codes that it had, cam sensor, distributor, neutral safety switch, replaced the cat coverter, did tune up, and it still dies when I am driving it. Now there are no error codes displayed in the computer its all at nothing. So I was wondering what can it be? He said its can be electrical issue, or fuel pump, I am tearing my head on this car and want it to not turn off randomly. Any ideas on what else to check? O and it starts right back up when I put it in park turn it off then crank it again and runs normal.