You'll need to get more information. Find an auto parts store that offers free engine code readouts and have them tell you what the engine computer has detected. This will shorten the long list of possible causes. Post again with the results - you may get to post your own solution.
I've had a bad fuel injector driver transistor in the computer (throttle body injection) and an ignition module do this to me.
Most probably cause, ignition coil or ignition module. Take out the TBI cover and filter. Turn switch on while see the injectors, if it spray a shot of gas, the cause is bad coil. If you not see the spray, the ignition module is overheated. I recomend to change and make sure, REALLY SURE, the heat sink paste was generously apllied between new module and base.
SOURCE: On my 1991 3.1 chev
some common problem in the summer when car get hot over and over the ignition (coil) is affected it will make your car cold run fine but cuts off when hot if occurred look for the coil
if you let car cools down for an hour then it started and work fine until cut off when hot again sure it is coil .
SOURCE: 1991 chevy lumina 3.1 starts cold but when warm shuts off
replace the ignition control module.
SOURCE: 3.1 1993 lumina starts fine as it warms up it
Unplug the temperature sensor and see what happens. If no change then the temp sensor plug maybe plugged somewhere it should not be. Sometimes it isb possible there are missmatched sensor connectors.
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