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A combination of problems could be causing your hesitation/stall issue:
Bad MAF (Mass Air Flow) sensor
Bad TPS (Throttle Position Sensor)
Getting a free diagnostic test to pull codes will make narrowing down your problem a bit easier. Most chain auto parts stores will do a complimentary diagnostic test. The most common cause with a car that stalls when warm is the TPS. It controls your idling speed under all conditions. Even replacing the MAF alone doesn't always fix the problem although it may show up as being problematic. The 2 parts basically go hand in hand with your particular problem.
I would change your plugs and wires with original a/c delco factory wires and plugs.My buick did the same and got corrected with factory wires and plugs.I tried most of the after market and they didn't do the job.
Filling it up with 92 octane will not help you so save your money to get other cool **** . If you want to put higher grade gas to the 89 ,but 87 will do the trick. Have you checked your pcv valve and hoses you might have a vaccum leak.