Hi,
How does the engine run prior to placing it in gear? Does the stalling seem related to an engine or transmission issue? Also, have you checked for diagnostic trouble codes that could point us in the right direction? If you haven't, that is where I would start. Here is a quick video showing how it's done.
https://youtu.be/b2IJGfImVvw
If you don't have a scan tool, often times, a parts store will lend one to you.
As I'm sure you are aware, there really isn't anything that a radiator replacement should cause to do this. By chance, was the engine overheated prior to the radiator replacement?
Let me know anything you can that may point me in the right direction.
Let me know,
Joe
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Wednesday, April 19th, 2023 AT 6:25 PM