Yes, it was a combination of a bad ECU and Fuse Box Corrosion. Once the owner gets it started, runs fine. Now the issue is the battery is not charging. Replace the Rectifier, got 14 vdc on the battery. Now am only seeing 13 vdc. When I have time , gonna have to verify the alternator output. Then I am gonna have to make a new fuse box, can't buy one as you have to buy a complete wiring harness which is like $400.00 which the owner doesn't have.
If you could post a video of it running then dying, that would be great.
One thing I would try is take off the air filter, and get either starting fluid or carburetor cleaner, and when it starts to die, spray it into the carb .
If revs it back up, it can be narrowed down to a fuel issue.
If not it could be a spark issue. Or a valve problem. Which is least likely.