what causes a car to die after replacing alternator and battery in a 1995 oldsmobile cutlass ciera

Some General Motors cars "Forget" how to idle after battery is disconnected. There is an Idle re-learn procedure, but mostly it involves normal driving when engine is up to temp. If that does not solve your stalling issue would recommend having a shop take a look. Here at All Pro Automotive, test drives and visual inspections are free, minor charges for actual diagnostic work. Give us a call if we can be of any help (904) 241-4800