Shuddering on low acceleration on the move

[Peter G]

I have an outback BPH year 2008 2.5 turbo, AT with SI DRIVE. When the car is on the move, and accelerate just lightly to keep it in constant motion, vehicle shudders until I either release the accelerator, shift gear upwards or accelerate harder. I Have replaced the rear differential and entire gearbox. Upon replacing each, it stops but with time starts again, meaning it's most likely not either of these two items. No error codes or warning lights.

Any ideas on what?

 

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