At a total loss for an explanation

The possibility of the timing chain jumping lead me to pull the engine, paint it, paint the engine bay, and restore or buy almost every mechanical or electrical part in the bay. I found a tight double roller, so that possibility was eliminated. And now it looks great under the hood too. LOL!!!

The problem I had before all this work was a stutter. It was like it was missing slightly when I let off the accelerator. Now it just warms up and dies.
Back to my basic question, as soon as it dies, do you loose spark or fuel?