I have a 1991 Olds cutlass ciera 3.3 v6, starts up fine when cold/cool. Runs down road fine till warm, then stalls, will not restart. Cranks fine, just won't fire up. You can pull air filter, sprinkle lightly with gas, reinstall, and it cranks right up, run fine for 10 minutes, then maybe shutoff...or run for a day or two. I've changed Crank position sensor, put in brand new battery, Had Ignition control pad ( below coils) tested, ok. New fuel pump, new fuel filter, cleaned throttle body, cleaned and replaced air idle control valve. I can't figure what is shutting off injectors, when warmed up, will not restart till you add a little fuel, and it fires right up.

I have one of these cars and it has ate my lunch on trying to fix the problem. the exact same problem and symptoms with me replacing the same parts you have. i have traced it down to a bad fuel injector. this engine design fires all three injectors on each bank of the motor at the same time. one bank is wire 467 and the other is 468. it actually grounds the circuit in the ecm. it appears that too much current shuts down the circuit on the ecm. my bad injector had an ohm reading of 3.2 ohms. the normal ones seemed to be between 8 and 12 ohms. good luck. I have one of these cars and it has ate my lunch on trying to fix the problem. the exact same problem and symptoms with me replacing the same parts you have. i have traced it down to a bad fuel injector. this engine design fires all three injectors on each bank of the motor at the same time. one bank is wire 467 and the other is 468. it actually grounds the circuit in the ecm. it appears that too much current shuts down the circuit on the ecm. my bad injector had an ohm reading of 3.2 ohms. the normal ones seemed to be between 8 and 12 ohms. good luck.