Hi and thanks for using 2CarPros.com.
I have a feeling there is an air leak somewhere which resulted from taking things apart to replace the radiator. Take a look through this link. It discusses reasons why an engine will stall at idle.
https://www.2carpros.com/articles/stall-at-idle
Let me know if anything there helps or if you have additional questions.
Take care,
Joe
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Saturday, October 6th, 2018 AT 8:19 PM