Lexus Jerk

[Farazmad]

When the engine is cold and i'm speeding up, i feel a jerk when the car hits 2000-2500 rpm

I drove my friend's ES350 and his engine was also cold, but his car did not jerk at 2000-2500 rpm

Seems like the car jerks only when accelerating slowly

Between 1500-2500 RPM

Even after warmed up

Taking it to Lexus on Saturday. Charging me $100 for diaognostics

But if they find a problem thats covered, they wont charge

Do you guys think the problem is powertrain?

[Farazmad]

I read about transmission shift flare

But i dont quite understand if that is what my car is doing