man, unless you see something obvious, you can't diagnose a problem that's non-existent. And loss of fuel will kill a car as fast as an ignition issue will...
You gotta catch it when it's acting up, and check for spark.
Were it me, I'd drive it. And I'd be armed at all times with my multimeter, some alligator clip jumper wires, a spare fuel pump relay, and whatever else you might have on hand.
And check the wiring down by the alternator. That is to say, if it's running, wiggle it and see if she dies. If not running, wiggle it and see if it starts. Seems I had an issue down there with an '82 K-jet. I bypassed something or other (think it was a red/white wire) that went to the coil.
That car has mostly been fine since.
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-Matt I ♥ my ♂
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