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Congrats on the longevity of your car.
I would recommend performing a tune-up on the car, or checking everything that ordinarily would be changed or adjusted when doing one. Also, I would make certain that the air flow meter and throttle body are clean. Perhaps adding an additive to try to clean the fuel injectors would help.
The stalling after you have been up to speed is likely air in the cooling system, or perhaps a non-properly adjusted throttle positioning sensor. Best guess is the former, in which case bleeding the system should help.
At a certain point, I think you will need to evaluate the costs/benefits of putting additional funds into the car versus buying another with fewer miles. I'm certain many parts are worn, fatigued, etc…
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