2017 Chrysler 300C - Stutters

engine shutters when down shifting, between 1500 and 2500 rpms, fuel mileage reduced.

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Torque converter shudder? Doesn’t your vehicle have a 5/50000 powertrain warranty?

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Is the check engine light on? What are the error codes?

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+1
If this car is still covered by that Powertrain Warranty, the OP doesn’t need to try to diagnose this himself, and should simply take it to the dealership.