My 97 buick lasabre had same issue.... its a ground issue... i ran a ground for the fuel pump curcuit under rear seat and it solved running issues and windows and locks.
Remove all three cables from battery, clean connections and replace bolts
Sounds like you a loose 12V connection at the relay box.Locate the relay box and when the engine is running wriggle the wiring harness or shake the relay bow and see if that's when the engine stalls. You may even have a bad / loose ground to the relays.
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