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Maf shouldn't start applying corrections until closed loop. You are going to have to figure out what the car is losing causing the stall. Probably the simplest thing would be to spray carb cleaner into the throttle body. If it continues to run, you are losing fuel. If not, you may still be losing fuel but also losing spark. If you have a fuel pressure gauge, check your readings key on for the prime and while it briefly runs. Should be around 41-47 psi primed and 3-10 psi less while idling.
If you can rent/borrow/buy/make, a noid light will be helpful to know if the injectors are firing. You disconnect one injector, insert the light into the connector, and fire it off. It should blink while running. If it stops blinking AND THEN the car stalls, there is an issue with them receiving a signal.
Finally, you can remove a plug wire and use your preferred method for checking spark during the stall.
Things that could be going on are opti signal, vats, fuel pressure, injector signal, icm, and on and on. First thing first, find out what the car is losing to cause your stall!
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