Sort of indicates the electrical distribution needs attention. Good that you replaced the battery and alternator but you still have an issue with some power loss, like wiggling wires restores connectivity. Start at the battery, use a wire brush, and some water mixed with baking soda if you see any green or powdery corrosion to dip your battery cable ends in. Usually the wire brush cleans well enough, you want all connections shiny metal to metal contact. Follow both cables and the splices or pigtails to where they connect, like that alternate positive post. The more you can remove, clean, and retighten all the connections you can, the more likely you wont have such gremlins reappear.
SOURCE: 1995 chevy caprice classic
Try replacing your fuel pump relay, Its common on chevys.Those fuel pumps are too expensive to keep replacing
SOURCE: 1995 lumina cranks but will not start
Sounds like it has jumped timing, dont know which engine you have so could be chain or belt.
SOURCE: 98 Chevy Tahoe 5.7 liter engine cuts out and
Have you checked for vaccume leaks?
You've got lots of parts in there, Has the problem been the reason you have replaced all of those, or did it come up while doing some of the repairs?
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