ECM Could Have Problems - 3000GT

93' Mitsubishi 3000GT
160,000 Miles.

My husband had a hotwire loose to his car when he was driving one day.
The car shutdown or stalled on him.
He tightened the hotwire to the cable and it started back up.
A half-hour later it stalled again then about 3 more times it shutdown.
He brought it home, took the battery cables off for about a day and a half then he hooked em back up to see if the computer was going to do that again but it wouldn't die out anymore.
He's afraid to drive it anymore incase it would shutdown.
He can't get it to stall on him anymore.

Do you see any problems?
Anything he might check?
Could the computer have reset itself when he hooked the cables back?
He don't want to get out on the road and it stall again so we need some advice.

Thx,
Deborah.