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I am having almost the exact same problem with my 1990 silverado 350ci (approx 60k miles on rebuilt engine) perhaps some of the things i tried can help you, and hopefully someone can give me a pointer or two...
I had drove it home from work - perfectly fine - one night, and the next morning i went out to leave and it would turn and turn but never fire AT ALL.... i removed my air cleaner and looked into the intake and i was getting no fuel from the fuel injectors, so initially i assumed fuel pump... so i purchased a fuel pump, but a couple days later i went to test something and it fired up immediately and ran PERFECT! i continued to drive it for about 3 more days, and it started running rough, so i thought maybe i should go ahead and replace my fuel filter.... it ran good again, until yesterday while on my way to my dads house, it began running rough again, and finally DIED as i was pulling into a convenience market to check things out. wouldnt start - no fuel coming thru injectors yet again!
it spent last night at the store, and this evening i went to mess with it, and turned it over and it fired up again, but was still running rough, so i tried to get it to my dads (5 miles down the road) it didnt make it 1/8th a mile before dieing again. this time its spending the night at a grocery store parking lot (a bit of frustration at the moment....)
today it acted like it wanted to run, but just wasnt firing on all cylenders. i had the same problem with a S10 once, so i did an electrical tune up - replaced the plugs, plug wires, dist. cap, and button
but still, same exact problem (although that old distributor DID need replacing.....)
when looking at the injectors (cant look too close, had a couple flame-ups, almost lost eyebrows!) it doesnt really look like i'm getting a good even spray.... it even looks like its sputtering some...
with all that said, is it still possible that i'm looking at a fuel pump problem? (remember, on at least 2 occasions, i wasnt getting ANY fuel at all from the injectors) clogged fuel injectors? this all began to happen after a fill-up at a gas station, bad gas? still wouldnt explain the no-fuel problem... i thought even possible timing chain jump too but again, that STILL doesnt explain the no fuel thing....
again what i HAVE done is:
replaced fuel filter
replaced spark plugs, wires, dist cap, button
kicked fender & gritted my teeth some
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