My nephew bought a '93 non-turbo automatic. We have rebuilt a ton of stuff. The only issue left is that when driving, the engine simply shuts off. Initially I thought it was a fuel delivery issue, but it's definitely an electrical issue. It begins after the vehicle warms up and gets progressively worse. Initially the engine quits for about 2 seconds and relights by itself. The time of not running increases until it just won't run or start. After cooling for a while, back to running fine. I know very little about these vehicles and am in need of some advice.