This maybe be due to a clogged fuel filter aslo under the upper plenum(intake) there is and fuel dist. it has six plastic lines coming out of it they are known to crack and break ( vortec v6 ) if the filter is not the problem and you have plenty of fuel pressure coming out of the line i whould get those lines.
Sounds like not enough fuel pressure. could be the pump getting weak. (common problem) or the filter may be plugged up. the filter is the cheapest.
Hope this helps
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