1995 Pontiac Grand Prix power failure when driving not fuel related
the battery connections are corroded, wirebrush and hose them off. The ground connection to the chassis and to the engine may also have corrosion. Clean it off and all will be skippy in skippytown.
check underhood at air intake snorkel for disconnected wire plugs to mass air flow sensor or something blocking air flow
if neither of those work check to make sure its not your alternator. its not common in GM cars to do that but really common in VW and AUDI. if ALT is bad it would do that too.
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